2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * SPDX-License-Identifier: GPL-2.0-only
16 #include <sys/types.h>
18 #include <urcu/compiler.h>
21 #include <common/compat/errno.h>
22 #include <common/common.h>
23 #include <common/sessiond-comm/sessiond-comm.h>
25 #include "buffer-registry.h"
27 #include "health-sessiond.h"
29 #include "ust-consumer.h"
30 #include "lttng-ust-ctl.h"
31 #include "lttng-ust-error.h"
34 #include "lttng-sessiond.h"
35 #include "notification-thread-commands.h"
38 struct lttng_ht
*ust_app_ht
;
39 struct lttng_ht
*ust_app_ht_by_sock
;
40 struct lttng_ht
*ust_app_ht_by_notify_sock
;
43 int ust_app_flush_app_session(struct ust_app
*app
, struct ust_app_session
*ua_sess
);
45 /* Next available channel key. Access under next_channel_key_lock. */
46 static uint64_t _next_channel_key
;
47 static pthread_mutex_t next_channel_key_lock
= PTHREAD_MUTEX_INITIALIZER
;
49 /* Next available session ID. Access under next_session_id_lock. */
50 static uint64_t _next_session_id
;
51 static pthread_mutex_t next_session_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
54 * Return the incremented value of next_channel_key.
56 static uint64_t get_next_channel_key(void)
60 pthread_mutex_lock(&next_channel_key_lock
);
61 ret
= ++_next_channel_key
;
62 pthread_mutex_unlock(&next_channel_key_lock
);
67 * Return the atomically incremented value of next_session_id.
69 static uint64_t get_next_session_id(void)
73 pthread_mutex_lock(&next_session_id_lock
);
74 ret
= ++_next_session_id
;
75 pthread_mutex_unlock(&next_session_id_lock
);
79 static void copy_channel_attr_to_ustctl(
80 struct ustctl_consumer_channel_attr
*attr
,
81 struct lttng_ust_channel_attr
*uattr
)
83 /* Copy event attributes since the layout is different. */
84 attr
->subbuf_size
= uattr
->subbuf_size
;
85 attr
->num_subbuf
= uattr
->num_subbuf
;
86 attr
->overwrite
= uattr
->overwrite
;
87 attr
->switch_timer_interval
= uattr
->switch_timer_interval
;
88 attr
->read_timer_interval
= uattr
->read_timer_interval
;
89 attr
->output
= uattr
->output
;
90 attr
->blocking_timeout
= uattr
->u
.s
.blocking_timeout
;
94 * Match function for the hash table lookup.
96 * It matches an ust app event based on three attributes which are the event
97 * name, the filter bytecode and the loglevel.
99 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
101 struct ust_app_event
*event
;
102 const struct ust_app_ht_key
*key
;
103 int ev_loglevel_value
;
108 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
110 ev_loglevel_value
= event
->attr
.loglevel
;
112 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
115 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
119 /* Event loglevel. */
120 if (ev_loglevel_value
!= key
->loglevel_type
) {
121 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
122 && key
->loglevel_type
== 0 &&
123 ev_loglevel_value
== -1) {
125 * Match is accepted. This is because on event creation, the
126 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
127 * -1 are accepted for this loglevel type since 0 is the one set by
128 * the API when receiving an enable event.
135 /* One of the filters is NULL, fail. */
136 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
140 if (key
->filter
&& event
->filter
) {
141 /* Both filters exists, check length followed by the bytecode. */
142 if (event
->filter
->len
!= key
->filter
->len
||
143 memcmp(event
->filter
->data
, key
->filter
->data
,
144 event
->filter
->len
) != 0) {
149 /* One of the exclusions is NULL, fail. */
150 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
154 if (key
->exclusion
&& event
->exclusion
) {
155 /* Both exclusions exists, check count followed by the names. */
156 if (event
->exclusion
->count
!= key
->exclusion
->count
||
157 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
158 event
->exclusion
->count
* LTTNG_UST_SYM_NAME_LEN
) != 0) {
172 * Unique add of an ust app event in the given ht. This uses the custom
173 * ht_match_ust_app_event match function and the event name as hash.
175 static void add_unique_ust_app_event(struct ust_app_channel
*ua_chan
,
176 struct ust_app_event
*event
)
178 struct cds_lfht_node
*node_ptr
;
179 struct ust_app_ht_key key
;
183 assert(ua_chan
->events
);
186 ht
= ua_chan
->events
;
187 key
.name
= event
->attr
.name
;
188 key
.filter
= event
->filter
;
189 key
.loglevel_type
= event
->attr
.loglevel
;
190 key
.exclusion
= event
->exclusion
;
192 node_ptr
= cds_lfht_add_unique(ht
->ht
,
193 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
194 ht_match_ust_app_event
, &key
, &event
->node
.node
);
195 assert(node_ptr
== &event
->node
.node
);
199 * Close the notify socket from the given RCU head object. This MUST be called
200 * through a call_rcu().
202 static void close_notify_sock_rcu(struct rcu_head
*head
)
205 struct ust_app_notify_sock_obj
*obj
=
206 caa_container_of(head
, struct ust_app_notify_sock_obj
, head
);
208 /* Must have a valid fd here. */
209 assert(obj
->fd
>= 0);
211 ret
= close(obj
->fd
);
213 ERR("close notify sock %d RCU", obj
->fd
);
215 lttng_fd_put(LTTNG_FD_APPS
, 1);
221 * Return the session registry according to the buffer type of the given
224 * A registry per UID object MUST exists before calling this function or else
225 * it assert() if not found. RCU read side lock must be acquired.
227 static struct ust_registry_session
*get_session_registry(
228 struct ust_app_session
*ua_sess
)
230 struct ust_registry_session
*registry
= NULL
;
234 switch (ua_sess
->buffer_type
) {
235 case LTTNG_BUFFER_PER_PID
:
237 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
241 registry
= reg_pid
->registry
->reg
.ust
;
244 case LTTNG_BUFFER_PER_UID
:
246 struct buffer_reg_uid
*reg_uid
= buffer_reg_uid_find(
247 ua_sess
->tracing_id
, ua_sess
->bits_per_long
,
248 lttng_credentials_get_uid(&ua_sess
->real_credentials
));
252 registry
= reg_uid
->registry
->reg
.ust
;
264 * Delete ust context safely. RCU read lock must be held before calling
268 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
,
276 pthread_mutex_lock(&app
->sock_lock
);
277 ret
= ustctl_release_object(sock
, ua_ctx
->obj
);
278 pthread_mutex_unlock(&app
->sock_lock
);
279 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
280 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
281 sock
, ua_ctx
->obj
->handle
, ret
);
289 * Delete ust app event safely. RCU read lock must be held before calling
293 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
,
300 free(ua_event
->filter
);
301 if (ua_event
->exclusion
!= NULL
)
302 free(ua_event
->exclusion
);
303 if (ua_event
->obj
!= NULL
) {
304 pthread_mutex_lock(&app
->sock_lock
);
305 ret
= ustctl_release_object(sock
, ua_event
->obj
);
306 pthread_mutex_unlock(&app
->sock_lock
);
307 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
308 ERR("UST app sock %d release event obj failed with ret %d",
317 * Release ust data object of the given stream.
319 * Return 0 on success or else a negative value.
321 static int release_ust_app_stream(int sock
, struct ust_app_stream
*stream
,
329 pthread_mutex_lock(&app
->sock_lock
);
330 ret
= ustctl_release_object(sock
, stream
->obj
);
331 pthread_mutex_unlock(&app
->sock_lock
);
332 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
333 ERR("UST app sock %d release stream obj failed with ret %d",
336 lttng_fd_put(LTTNG_FD_APPS
, 2);
344 * Delete ust app stream safely. RCU read lock must be held before calling
348 void delete_ust_app_stream(int sock
, struct ust_app_stream
*stream
,
353 (void) release_ust_app_stream(sock
, stream
, app
);
358 * We need to execute ht_destroy outside of RCU read-side critical
359 * section and outside of call_rcu thread, so we postpone its execution
360 * using ht_cleanup_push. It is simpler than to change the semantic of
361 * the many callers of delete_ust_app_session().
364 void delete_ust_app_channel_rcu(struct rcu_head
*head
)
366 struct ust_app_channel
*ua_chan
=
367 caa_container_of(head
, struct ust_app_channel
, rcu_head
);
369 ht_cleanup_push(ua_chan
->ctx
);
370 ht_cleanup_push(ua_chan
->events
);
375 * Extract the lost packet or discarded events counter when the channel is
376 * being deleted and store the value in the parent channel so we can
377 * access it from lttng list and at stop/destroy.
379 * The session list lock must be held by the caller.
382 void save_per_pid_lost_discarded_counters(struct ust_app_channel
*ua_chan
)
384 uint64_t discarded
= 0, lost
= 0;
385 struct ltt_session
*session
;
386 struct ltt_ust_channel
*uchan
;
388 if (ua_chan
->attr
.type
!= LTTNG_UST_CHAN_PER_CPU
) {
393 session
= session_find_by_id(ua_chan
->session
->tracing_id
);
394 if (!session
|| !session
->ust_session
) {
396 * Not finding the session is not an error because there are
397 * multiple ways the channels can be torn down.
399 * 1) The session daemon can initiate the destruction of the
400 * ust app session after receiving a destroy command or
401 * during its shutdown/teardown.
402 * 2) The application, since we are in per-pid tracing, is
403 * unregistering and tearing down its ust app session.
405 * Both paths are protected by the session list lock which
406 * ensures that the accounting of lost packets and discarded
407 * events is done exactly once. The session is then unpublished
408 * from the session list, resulting in this condition.
413 if (ua_chan
->attr
.overwrite
) {
414 consumer_get_lost_packets(ua_chan
->session
->tracing_id
,
415 ua_chan
->key
, session
->ust_session
->consumer
,
418 consumer_get_discarded_events(ua_chan
->session
->tracing_id
,
419 ua_chan
->key
, session
->ust_session
->consumer
,
422 uchan
= trace_ust_find_channel_by_name(
423 session
->ust_session
->domain_global
.channels
,
426 ERR("Missing UST channel to store discarded counters");
430 uchan
->per_pid_closed_app_discarded
+= discarded
;
431 uchan
->per_pid_closed_app_lost
+= lost
;
436 session_put(session
);
441 * Delete ust app channel safely. RCU read lock must be held before calling
444 * The session list lock must be held by the caller.
447 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
,
451 struct lttng_ht_iter iter
;
452 struct ust_app_event
*ua_event
;
453 struct ust_app_ctx
*ua_ctx
;
454 struct ust_app_stream
*stream
, *stmp
;
455 struct ust_registry_session
*registry
;
459 DBG3("UST app deleting channel %s", ua_chan
->name
);
462 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
463 cds_list_del(&stream
->list
);
464 delete_ust_app_stream(sock
, stream
, app
);
468 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
469 cds_list_del(&ua_ctx
->list
);
470 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
472 delete_ust_app_ctx(sock
, ua_ctx
, app
);
476 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
478 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
480 delete_ust_app_event(sock
, ua_event
, app
);
483 if (ua_chan
->session
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
484 /* Wipe and free registry from session registry. */
485 registry
= get_session_registry(ua_chan
->session
);
487 ust_registry_channel_del_free(registry
, ua_chan
->key
,
491 * A negative socket can be used by the caller when
492 * cleaning-up a ua_chan in an error path. Skip the
493 * accounting in this case.
496 save_per_pid_lost_discarded_counters(ua_chan
);
500 if (ua_chan
->obj
!= NULL
) {
501 /* Remove channel from application UST object descriptor. */
502 iter
.iter
.node
= &ua_chan
->ust_objd_node
.node
;
503 ret
= lttng_ht_del(app
->ust_objd
, &iter
);
505 pthread_mutex_lock(&app
->sock_lock
);
506 ret
= ustctl_release_object(sock
, ua_chan
->obj
);
507 pthread_mutex_unlock(&app
->sock_lock
);
508 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
509 ERR("UST app sock %d release channel obj failed with ret %d",
512 lttng_fd_put(LTTNG_FD_APPS
, 1);
515 call_rcu(&ua_chan
->rcu_head
, delete_ust_app_channel_rcu
);
518 int ust_app_register_done(struct ust_app
*app
)
522 pthread_mutex_lock(&app
->sock_lock
);
523 ret
= ustctl_register_done(app
->sock
);
524 pthread_mutex_unlock(&app
->sock_lock
);
528 int ust_app_release_object(struct ust_app
*app
, struct lttng_ust_object_data
*data
)
533 pthread_mutex_lock(&app
->sock_lock
);
538 ret
= ustctl_release_object(sock
, data
);
540 pthread_mutex_unlock(&app
->sock_lock
);
546 * Push metadata to consumer socket.
548 * RCU read-side lock must be held to guarantee existance of socket.
549 * Must be called with the ust app session lock held.
550 * Must be called with the registry lock held.
552 * On success, return the len of metadata pushed or else a negative value.
553 * Returning a -EPIPE return value means we could not send the metadata,
554 * but it can be caused by recoverable errors (e.g. the application has
555 * terminated concurrently).
557 ssize_t
ust_app_push_metadata(struct ust_registry_session
*registry
,
558 struct consumer_socket
*socket
, int send_zero_data
)
561 char *metadata_str
= NULL
;
562 size_t len
, offset
, new_metadata_len_sent
;
564 uint64_t metadata_key
, metadata_version
;
569 metadata_key
= registry
->metadata_key
;
572 * Means that no metadata was assigned to the session. This can
573 * happens if no start has been done previously.
579 offset
= registry
->metadata_len_sent
;
580 len
= registry
->metadata_len
- registry
->metadata_len_sent
;
581 new_metadata_len_sent
= registry
->metadata_len
;
582 metadata_version
= registry
->metadata_version
;
584 DBG3("No metadata to push for metadata key %" PRIu64
,
585 registry
->metadata_key
);
587 if (send_zero_data
) {
588 DBG("No metadata to push");
594 /* Allocate only what we have to send. */
595 metadata_str
= zmalloc(len
);
597 PERROR("zmalloc ust app metadata string");
601 /* Copy what we haven't sent out. */
602 memcpy(metadata_str
, registry
->metadata
+ offset
, len
);
605 pthread_mutex_unlock(®istry
->lock
);
607 * We need to unlock the registry while we push metadata to
608 * break a circular dependency between the consumerd metadata
609 * lock and the sessiond registry lock. Indeed, pushing metadata
610 * to the consumerd awaits that it gets pushed all the way to
611 * relayd, but doing so requires grabbing the metadata lock. If
612 * a concurrent metadata request is being performed by
613 * consumerd, this can try to grab the registry lock on the
614 * sessiond while holding the metadata lock on the consumer
615 * daemon. Those push and pull schemes are performed on two
616 * different bidirectionnal communication sockets.
618 ret
= consumer_push_metadata(socket
, metadata_key
,
619 metadata_str
, len
, offset
, metadata_version
);
620 pthread_mutex_lock(®istry
->lock
);
623 * There is an acceptable race here between the registry
624 * metadata key assignment and the creation on the
625 * consumer. The session daemon can concurrently push
626 * metadata for this registry while being created on the
627 * consumer since the metadata key of the registry is
628 * assigned *before* it is setup to avoid the consumer
629 * to ask for metadata that could possibly be not found
630 * in the session daemon.
632 * The metadata will get pushed either by the session
633 * being stopped or the consumer requesting metadata if
634 * that race is triggered.
636 if (ret
== -LTTCOMM_CONSUMERD_CHANNEL_FAIL
) {
639 ERR("Error pushing metadata to consumer");
645 * Metadata may have been concurrently pushed, since
646 * we're not holding the registry lock while pushing to
647 * consumer. This is handled by the fact that we send
648 * the metadata content, size, and the offset at which
649 * that metadata belongs. This may arrive out of order
650 * on the consumer side, and the consumer is able to
651 * deal with overlapping fragments. The consumer
652 * supports overlapping fragments, which must be
653 * contiguous starting from offset 0. We keep the
654 * largest metadata_len_sent value of the concurrent
657 registry
->metadata_len_sent
=
658 max_t(size_t, registry
->metadata_len_sent
,
659 new_metadata_len_sent
);
668 * On error, flag the registry that the metadata is
669 * closed. We were unable to push anything and this
670 * means that either the consumer is not responding or
671 * the metadata cache has been destroyed on the
674 registry
->metadata_closed
= 1;
682 * For a given application and session, push metadata to consumer.
683 * Either sock or consumer is required : if sock is NULL, the default
684 * socket to send the metadata is retrieved from consumer, if sock
685 * is not NULL we use it to send the metadata.
686 * RCU read-side lock must be held while calling this function,
687 * therefore ensuring existance of registry. It also ensures existance
688 * of socket throughout this function.
690 * Return 0 on success else a negative error.
691 * Returning a -EPIPE return value means we could not send the metadata,
692 * but it can be caused by recoverable errors (e.g. the application has
693 * terminated concurrently).
695 static int push_metadata(struct ust_registry_session
*registry
,
696 struct consumer_output
*consumer
)
700 struct consumer_socket
*socket
;
705 pthread_mutex_lock(®istry
->lock
);
706 if (registry
->metadata_closed
) {
711 /* Get consumer socket to use to push the metadata.*/
712 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
719 ret
= ust_app_push_metadata(registry
, socket
, 0);
724 pthread_mutex_unlock(®istry
->lock
);
728 pthread_mutex_unlock(®istry
->lock
);
733 * Send to the consumer a close metadata command for the given session. Once
734 * done, the metadata channel is deleted and the session metadata pointer is
735 * nullified. The session lock MUST be held unless the application is
736 * in the destroy path.
738 * Do not hold the registry lock while communicating with the consumerd, because
739 * doing so causes inter-process deadlocks between consumerd and sessiond with
740 * the metadata request notification.
742 * Return 0 on success else a negative value.
744 static int close_metadata(struct ust_registry_session
*registry
,
745 struct consumer_output
*consumer
)
748 struct consumer_socket
*socket
;
749 uint64_t metadata_key
;
750 bool registry_was_already_closed
;
757 pthread_mutex_lock(®istry
->lock
);
758 metadata_key
= registry
->metadata_key
;
759 registry_was_already_closed
= registry
->metadata_closed
;
760 if (metadata_key
!= 0) {
762 * Metadata closed. Even on error this means that the consumer
763 * is not responding or not found so either way a second close
764 * should NOT be emit for this registry.
766 registry
->metadata_closed
= 1;
768 pthread_mutex_unlock(®istry
->lock
);
770 if (metadata_key
== 0 || registry_was_already_closed
) {
775 /* Get consumer socket to use to push the metadata.*/
776 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
783 ret
= consumer_close_metadata(socket
, metadata_key
);
794 * We need to execute ht_destroy outside of RCU read-side critical
795 * section and outside of call_rcu thread, so we postpone its execution
796 * using ht_cleanup_push. It is simpler than to change the semantic of
797 * the many callers of delete_ust_app_session().
800 void delete_ust_app_session_rcu(struct rcu_head
*head
)
802 struct ust_app_session
*ua_sess
=
803 caa_container_of(head
, struct ust_app_session
, rcu_head
);
805 ht_cleanup_push(ua_sess
->channels
);
810 * Delete ust app session safely. RCU read lock must be held before calling
813 * The session list lock must be held by the caller.
816 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
,
820 struct lttng_ht_iter iter
;
821 struct ust_app_channel
*ua_chan
;
822 struct ust_registry_session
*registry
;
826 pthread_mutex_lock(&ua_sess
->lock
);
828 assert(!ua_sess
->deleted
);
829 ua_sess
->deleted
= true;
831 registry
= get_session_registry(ua_sess
);
832 /* Registry can be null on error path during initialization. */
834 /* Push metadata for application before freeing the application. */
835 (void) push_metadata(registry
, ua_sess
->consumer
);
838 * Don't ask to close metadata for global per UID buffers. Close
839 * metadata only on destroy trace session in this case. Also, the
840 * previous push metadata could have flag the metadata registry to
841 * close so don't send a close command if closed.
843 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
844 /* And ask to close it for this session registry. */
845 (void) close_metadata(registry
, ua_sess
->consumer
);
849 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
851 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
853 delete_ust_app_channel(sock
, ua_chan
, app
);
856 /* In case of per PID, the registry is kept in the session. */
857 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
858 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
861 * Registry can be null on error path during
864 buffer_reg_pid_remove(reg_pid
);
865 buffer_reg_pid_destroy(reg_pid
);
869 if (ua_sess
->handle
!= -1) {
870 pthread_mutex_lock(&app
->sock_lock
);
871 ret
= ustctl_release_handle(sock
, ua_sess
->handle
);
872 pthread_mutex_unlock(&app
->sock_lock
);
873 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
874 ERR("UST app sock %d release session handle failed with ret %d",
877 /* Remove session from application UST object descriptor. */
878 iter
.iter
.node
= &ua_sess
->ust_objd_node
.node
;
879 ret
= lttng_ht_del(app
->ust_sessions_objd
, &iter
);
883 pthread_mutex_unlock(&ua_sess
->lock
);
885 consumer_output_put(ua_sess
->consumer
);
887 call_rcu(&ua_sess
->rcu_head
, delete_ust_app_session_rcu
);
891 * Delete a traceable application structure from the global list. Never call
892 * this function outside of a call_rcu call.
894 * RCU read side lock should _NOT_ be held when calling this function.
897 void delete_ust_app(struct ust_app
*app
)
900 struct ust_app_session
*ua_sess
, *tmp_ua_sess
;
903 * The session list lock must be held during this function to guarantee
904 * the existence of ua_sess.
907 /* Delete ust app sessions info */
912 cds_list_for_each_entry_safe(ua_sess
, tmp_ua_sess
, &app
->teardown_head
,
914 /* Free every object in the session and the session. */
916 delete_ust_app_session(sock
, ua_sess
, app
);
920 ht_cleanup_push(app
->sessions
);
921 ht_cleanup_push(app
->ust_sessions_objd
);
922 ht_cleanup_push(app
->ust_objd
);
925 * Wait until we have deleted the application from the sock hash table
926 * before closing this socket, otherwise an application could re-use the
927 * socket ID and race with the teardown, using the same hash table entry.
929 * It's OK to leave the close in call_rcu. We want it to stay unique for
930 * all RCU readers that could run concurrently with unregister app,
931 * therefore we _need_ to only close that socket after a grace period. So
932 * it should stay in this RCU callback.
934 * This close() is a very important step of the synchronization model so
935 * every modification to this function must be carefully reviewed.
941 lttng_fd_put(LTTNG_FD_APPS
, 1);
943 DBG2("UST app pid %d deleted", app
->pid
);
945 session_unlock_list();
949 * URCU intermediate call to delete an UST app.
952 void delete_ust_app_rcu(struct rcu_head
*head
)
954 struct lttng_ht_node_ulong
*node
=
955 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
956 struct ust_app
*app
=
957 caa_container_of(node
, struct ust_app
, pid_n
);
959 DBG3("Call RCU deleting app PID %d", app
->pid
);
964 * Delete the session from the application ht and delete the data structure by
965 * freeing every object inside and releasing them.
967 * The session list lock must be held by the caller.
969 static void destroy_app_session(struct ust_app
*app
,
970 struct ust_app_session
*ua_sess
)
973 struct lttng_ht_iter iter
;
978 iter
.iter
.node
= &ua_sess
->node
.node
;
979 ret
= lttng_ht_del(app
->sessions
, &iter
);
981 /* Already scheduled for teardown. */
985 /* Once deleted, free the data structure. */
986 delete_ust_app_session(app
->sock
, ua_sess
, app
);
993 * Alloc new UST app session.
996 struct ust_app_session
*alloc_ust_app_session(void)
998 struct ust_app_session
*ua_sess
;
1000 /* Init most of the default value by allocating and zeroing */
1001 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
1002 if (ua_sess
== NULL
) {
1007 ua_sess
->handle
= -1;
1008 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
1009 ua_sess
->metadata_attr
.type
= LTTNG_UST_CHAN_METADATA
;
1010 pthread_mutex_init(&ua_sess
->lock
, NULL
);
1019 * Alloc new UST app channel.
1022 struct ust_app_channel
*alloc_ust_app_channel(const char *name
,
1023 struct ust_app_session
*ua_sess
,
1024 struct lttng_ust_channel_attr
*attr
)
1026 struct ust_app_channel
*ua_chan
;
1028 /* Init most of the default value by allocating and zeroing */
1029 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
1030 if (ua_chan
== NULL
) {
1035 /* Setup channel name */
1036 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
1037 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1039 ua_chan
->enabled
= 1;
1040 ua_chan
->handle
= -1;
1041 ua_chan
->session
= ua_sess
;
1042 ua_chan
->key
= get_next_channel_key();
1043 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1044 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
1045 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
1047 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
1048 CDS_INIT_LIST_HEAD(&ua_chan
->ctx_list
);
1050 /* Copy attributes */
1052 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
1053 ua_chan
->attr
.subbuf_size
= attr
->subbuf_size
;
1054 ua_chan
->attr
.num_subbuf
= attr
->num_subbuf
;
1055 ua_chan
->attr
.overwrite
= attr
->overwrite
;
1056 ua_chan
->attr
.switch_timer_interval
= attr
->switch_timer_interval
;
1057 ua_chan
->attr
.read_timer_interval
= attr
->read_timer_interval
;
1058 ua_chan
->attr
.output
= attr
->output
;
1059 ua_chan
->attr
.blocking_timeout
= attr
->u
.s
.blocking_timeout
;
1061 /* By default, the channel is a per cpu channel. */
1062 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1064 DBG3("UST app channel %s allocated", ua_chan
->name
);
1073 * Allocate and initialize a UST app stream.
1075 * Return newly allocated stream pointer or NULL on error.
1077 struct ust_app_stream
*ust_app_alloc_stream(void)
1079 struct ust_app_stream
*stream
= NULL
;
1081 stream
= zmalloc(sizeof(*stream
));
1082 if (stream
== NULL
) {
1083 PERROR("zmalloc ust app stream");
1087 /* Zero could be a valid value for a handle so flag it to -1. */
1088 stream
->handle
= -1;
1095 * Alloc new UST app event.
1098 struct ust_app_event
*alloc_ust_app_event(char *name
,
1099 struct lttng_ust_event
*attr
)
1101 struct ust_app_event
*ua_event
;
1103 /* Init most of the default value by allocating and zeroing */
1104 ua_event
= zmalloc(sizeof(struct ust_app_event
));
1105 if (ua_event
== NULL
) {
1106 PERROR("Failed to allocate ust_app_event structure");
1110 ua_event
->enabled
= 1;
1111 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
1112 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1113 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
1115 /* Copy attributes */
1117 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
1120 DBG3("UST app event %s allocated", ua_event
->name
);
1129 * Alloc new UST app context.
1132 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context_attr
*uctx
)
1134 struct ust_app_ctx
*ua_ctx
;
1136 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
1137 if (ua_ctx
== NULL
) {
1141 CDS_INIT_LIST_HEAD(&ua_ctx
->list
);
1144 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
1145 if (uctx
->ctx
== LTTNG_UST_CONTEXT_APP_CONTEXT
) {
1146 char *provider_name
= NULL
, *ctx_name
= NULL
;
1148 provider_name
= strdup(uctx
->u
.app_ctx
.provider_name
);
1149 ctx_name
= strdup(uctx
->u
.app_ctx
.ctx_name
);
1150 if (!provider_name
|| !ctx_name
) {
1151 free(provider_name
);
1156 ua_ctx
->ctx
.u
.app_ctx
.provider_name
= provider_name
;
1157 ua_ctx
->ctx
.u
.app_ctx
.ctx_name
= ctx_name
;
1161 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
1169 * Allocate a filter and copy the given original filter.
1171 * Return allocated filter or NULL on error.
1173 static struct lttng_filter_bytecode
*copy_filter_bytecode(
1174 struct lttng_filter_bytecode
*orig_f
)
1176 struct lttng_filter_bytecode
*filter
= NULL
;
1178 /* Copy filter bytecode */
1179 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
1181 PERROR("zmalloc alloc filter bytecode");
1185 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
1192 * Create a liblttng-ust filter bytecode from given bytecode.
1194 * Return allocated filter or NULL on error.
1196 static struct lttng_ust_filter_bytecode
*create_ust_bytecode_from_bytecode(
1197 struct lttng_filter_bytecode
*orig_f
)
1199 struct lttng_ust_filter_bytecode
*filter
= NULL
;
1201 /* Copy filter bytecode */
1202 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
1204 PERROR("zmalloc alloc ust filter bytecode");
1208 assert(sizeof(struct lttng_filter_bytecode
) ==
1209 sizeof(struct lttng_ust_filter_bytecode
));
1210 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
1216 * Find an ust_app using the sock and return it. RCU read side lock must be
1217 * held before calling this helper function.
1219 struct ust_app
*ust_app_find_by_sock(int sock
)
1221 struct lttng_ht_node_ulong
*node
;
1222 struct lttng_ht_iter iter
;
1224 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1225 node
= lttng_ht_iter_get_node_ulong(&iter
);
1227 DBG2("UST app find by sock %d not found", sock
);
1231 return caa_container_of(node
, struct ust_app
, sock_n
);
1238 * Find an ust_app using the notify sock and return it. RCU read side lock must
1239 * be held before calling this helper function.
1241 static struct ust_app
*find_app_by_notify_sock(int sock
)
1243 struct lttng_ht_node_ulong
*node
;
1244 struct lttng_ht_iter iter
;
1246 lttng_ht_lookup(ust_app_ht_by_notify_sock
, (void *)((unsigned long) sock
),
1248 node
= lttng_ht_iter_get_node_ulong(&iter
);
1250 DBG2("UST app find by notify sock %d not found", sock
);
1254 return caa_container_of(node
, struct ust_app
, notify_sock_n
);
1261 * Lookup for an ust app event based on event name, filter bytecode and the
1264 * Return an ust_app_event object or NULL on error.
1266 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
1267 const char *name
, const struct lttng_filter_bytecode
*filter
,
1269 const struct lttng_event_exclusion
*exclusion
)
1271 struct lttng_ht_iter iter
;
1272 struct lttng_ht_node_str
*node
;
1273 struct ust_app_event
*event
= NULL
;
1274 struct ust_app_ht_key key
;
1279 /* Setup key for event lookup. */
1281 key
.filter
= filter
;
1282 key
.loglevel_type
= loglevel_value
;
1283 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1284 key
.exclusion
= exclusion
;
1286 /* Lookup using the event name as hash and a custom match fct. */
1287 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
1288 ht_match_ust_app_event
, &key
, &iter
.iter
);
1289 node
= lttng_ht_iter_get_node_str(&iter
);
1294 event
= caa_container_of(node
, struct ust_app_event
, node
);
1301 * Create the channel context on the tracer.
1303 * Called with UST app session lock held.
1306 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
1307 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
1311 health_code_update();
1313 pthread_mutex_lock(&app
->sock_lock
);
1314 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
1315 ua_chan
->obj
, &ua_ctx
->obj
);
1316 pthread_mutex_unlock(&app
->sock_lock
);
1318 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1319 ERR("UST app create channel context failed for app (pid: %d) "
1320 "with ret %d", app
->pid
, ret
);
1323 * This is normal behavior, an application can die during the
1324 * creation process. Don't report an error so the execution can
1325 * continue normally.
1328 DBG3("UST app add context failed. Application is dead.");
1333 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
1335 DBG2("UST app context handle %d created successfully for channel %s",
1336 ua_ctx
->handle
, ua_chan
->name
);
1339 health_code_update();
1344 * Set the filter on the tracer.
1347 int set_ust_event_filter(struct ust_app_event
*ua_event
,
1348 struct ust_app
*app
)
1351 struct lttng_ust_filter_bytecode
*ust_bytecode
= NULL
;
1353 health_code_update();
1355 if (!ua_event
->filter
) {
1360 ust_bytecode
= create_ust_bytecode_from_bytecode(ua_event
->filter
);
1361 if (!ust_bytecode
) {
1362 ret
= -LTTNG_ERR_NOMEM
;
1365 pthread_mutex_lock(&app
->sock_lock
);
1366 ret
= ustctl_set_filter(app
->sock
, ust_bytecode
,
1368 pthread_mutex_unlock(&app
->sock_lock
);
1370 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1371 ERR("UST app event %s filter failed for app (pid: %d) "
1372 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1375 * This is normal behavior, an application can die during the
1376 * creation process. Don't report an error so the execution can
1377 * continue normally.
1380 DBG3("UST app filter event failed. Application is dead.");
1385 DBG2("UST filter set successfully for event %s", ua_event
->name
);
1388 health_code_update();
1394 struct lttng_ust_event_exclusion
*create_ust_exclusion_from_exclusion(
1395 struct lttng_event_exclusion
*exclusion
)
1397 struct lttng_ust_event_exclusion
*ust_exclusion
= NULL
;
1398 size_t exclusion_alloc_size
= sizeof(struct lttng_ust_event_exclusion
) +
1399 LTTNG_UST_SYM_NAME_LEN
* exclusion
->count
;
1401 ust_exclusion
= zmalloc(exclusion_alloc_size
);
1402 if (!ust_exclusion
) {
1407 assert(sizeof(struct lttng_event_exclusion
) ==
1408 sizeof(struct lttng_ust_event_exclusion
));
1409 memcpy(ust_exclusion
, exclusion
, exclusion_alloc_size
);
1411 return ust_exclusion
;
1415 * Set event exclusions on the tracer.
1418 int set_ust_event_exclusion(struct ust_app_event
*ua_event
,
1419 struct ust_app
*app
)
1422 struct lttng_ust_event_exclusion
*ust_exclusion
= NULL
;
1424 health_code_update();
1426 if (!ua_event
->exclusion
|| !ua_event
->exclusion
->count
) {
1431 ust_exclusion
= create_ust_exclusion_from_exclusion(
1432 ua_event
->exclusion
);
1433 if (!ust_exclusion
) {
1434 ret
= -LTTNG_ERR_NOMEM
;
1437 pthread_mutex_lock(&app
->sock_lock
);
1438 ret
= ustctl_set_exclusion(app
->sock
, ust_exclusion
, ua_event
->obj
);
1439 pthread_mutex_unlock(&app
->sock_lock
);
1441 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1442 ERR("UST app event %s exclusions failed for app (pid: %d) "
1443 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1446 * This is normal behavior, an application can die during the
1447 * creation process. Don't report an error so the execution can
1448 * continue normally.
1451 DBG3("UST app event exclusion failed. Application is dead.");
1456 DBG2("UST exclusion set successfully for event %s", ua_event
->name
);
1459 health_code_update();
1460 free(ust_exclusion
);
1465 * Disable the specified event on to UST tracer for the UST session.
1467 static int disable_ust_event(struct ust_app
*app
,
1468 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1472 health_code_update();
1474 pthread_mutex_lock(&app
->sock_lock
);
1475 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
1476 pthread_mutex_unlock(&app
->sock_lock
);
1478 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1479 ERR("UST app event %s disable failed for app (pid: %d) "
1480 "and session handle %d with ret %d",
1481 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1484 * This is normal behavior, an application can die during the
1485 * creation process. Don't report an error so the execution can
1486 * continue normally.
1489 DBG3("UST app disable event failed. Application is dead.");
1494 DBG2("UST app event %s disabled successfully for app (pid: %d)",
1495 ua_event
->attr
.name
, app
->pid
);
1498 health_code_update();
1503 * Disable the specified channel on to UST tracer for the UST session.
1505 static int disable_ust_channel(struct ust_app
*app
,
1506 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1510 health_code_update();
1512 pthread_mutex_lock(&app
->sock_lock
);
1513 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
1514 pthread_mutex_unlock(&app
->sock_lock
);
1516 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1517 ERR("UST app channel %s disable failed for app (pid: %d) "
1518 "and session handle %d with ret %d",
1519 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1522 * This is normal behavior, an application can die during the
1523 * creation process. Don't report an error so the execution can
1524 * continue normally.
1527 DBG3("UST app disable channel failed. Application is dead.");
1532 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
1533 ua_chan
->name
, app
->pid
);
1536 health_code_update();
1541 * Enable the specified channel on to UST tracer for the UST session.
1543 static int enable_ust_channel(struct ust_app
*app
,
1544 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1548 health_code_update();
1550 pthread_mutex_lock(&app
->sock_lock
);
1551 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
1552 pthread_mutex_unlock(&app
->sock_lock
);
1554 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1555 ERR("UST app channel %s enable failed for app (pid: %d) "
1556 "and session handle %d with ret %d",
1557 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1560 * This is normal behavior, an application can die during the
1561 * creation process. Don't report an error so the execution can
1562 * continue normally.
1565 DBG3("UST app enable channel failed. Application is dead.");
1570 ua_chan
->enabled
= 1;
1572 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
1573 ua_chan
->name
, app
->pid
);
1576 health_code_update();
1581 * Enable the specified event on to UST tracer for the UST session.
1583 static int enable_ust_event(struct ust_app
*app
,
1584 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1588 health_code_update();
1590 pthread_mutex_lock(&app
->sock_lock
);
1591 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
1592 pthread_mutex_unlock(&app
->sock_lock
);
1594 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1595 ERR("UST app event %s enable failed for app (pid: %d) "
1596 "and session handle %d with ret %d",
1597 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1600 * This is normal behavior, an application can die during the
1601 * creation process. Don't report an error so the execution can
1602 * continue normally.
1605 DBG3("UST app enable event failed. Application is dead.");
1610 DBG2("UST app event %s enabled successfully for app (pid: %d)",
1611 ua_event
->attr
.name
, app
->pid
);
1614 health_code_update();
1619 * Send channel and stream buffer to application.
1621 * Return 0 on success. On error, a negative value is returned.
1623 static int send_channel_pid_to_ust(struct ust_app
*app
,
1624 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1627 struct ust_app_stream
*stream
, *stmp
;
1633 health_code_update();
1635 DBG("UST app sending channel %s to UST app sock %d", ua_chan
->name
,
1638 /* Send channel to the application. */
1639 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
1640 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
1641 ret
= -ENOTCONN
; /* Caused by app exiting. */
1643 } else if (ret
< 0) {
1647 health_code_update();
1649 /* Send all streams to application. */
1650 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
1651 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, stream
);
1652 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
1653 ret
= -ENOTCONN
; /* Caused by app exiting. */
1655 } else if (ret
< 0) {
1658 /* We don't need the stream anymore once sent to the tracer. */
1659 cds_list_del(&stream
->list
);
1660 delete_ust_app_stream(-1, stream
, app
);
1662 /* Flag the channel that it is sent to the application. */
1663 ua_chan
->is_sent
= 1;
1666 health_code_update();
1671 * Create the specified event onto the UST tracer for a UST session.
1673 * Should be called with session mutex held.
1676 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
1677 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
1681 health_code_update();
1683 /* Create UST event on tracer */
1684 pthread_mutex_lock(&app
->sock_lock
);
1685 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
1687 pthread_mutex_unlock(&app
->sock_lock
);
1689 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1691 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1692 ua_event
->attr
.name
, app
->pid
, ret
);
1695 * This is normal behavior, an application can die during the
1696 * creation process. Don't report an error so the execution can
1697 * continue normally.
1700 DBG3("UST app create event failed. Application is dead.");
1705 ua_event
->handle
= ua_event
->obj
->handle
;
1707 DBG2("UST app event %s created successfully for pid:%d",
1708 ua_event
->attr
.name
, app
->pid
);
1710 health_code_update();
1712 /* Set filter if one is present. */
1713 if (ua_event
->filter
) {
1714 ret
= set_ust_event_filter(ua_event
, app
);
1720 /* Set exclusions for the event */
1721 if (ua_event
->exclusion
) {
1722 ret
= set_ust_event_exclusion(ua_event
, app
);
1728 /* If event not enabled, disable it on the tracer */
1729 if (ua_event
->enabled
) {
1731 * We now need to explicitly enable the event, since it
1732 * is now disabled at creation.
1734 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1737 * If we hit an EPERM, something is wrong with our enable call. If
1738 * we get an EEXIST, there is a problem on the tracer side since we
1742 case -LTTNG_UST_ERR_PERM
:
1743 /* Code flow problem */
1745 case -LTTNG_UST_ERR_EXIST
:
1746 /* It's OK for our use case. */
1757 health_code_update();
1762 * Copy data between an UST app event and a LTT event.
1764 static void shadow_copy_event(struct ust_app_event
*ua_event
,
1765 struct ltt_ust_event
*uevent
)
1767 size_t exclusion_alloc_size
;
1769 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
1770 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1772 ua_event
->enabled
= uevent
->enabled
;
1774 /* Copy event attributes */
1775 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
1777 /* Copy filter bytecode */
1778 if (uevent
->filter
) {
1779 ua_event
->filter
= copy_filter_bytecode(uevent
->filter
);
1780 /* Filter might be NULL here in case of ENONEM. */
1783 /* Copy exclusion data */
1784 if (uevent
->exclusion
) {
1785 exclusion_alloc_size
= sizeof(struct lttng_event_exclusion
) +
1786 LTTNG_UST_SYM_NAME_LEN
* uevent
->exclusion
->count
;
1787 ua_event
->exclusion
= zmalloc(exclusion_alloc_size
);
1788 if (ua_event
->exclusion
== NULL
) {
1791 memcpy(ua_event
->exclusion
, uevent
->exclusion
,
1792 exclusion_alloc_size
);
1798 * Copy data between an UST app channel and a LTT channel.
1800 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
1801 struct ltt_ust_channel
*uchan
)
1803 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
1805 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
1806 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1808 ua_chan
->tracefile_size
= uchan
->tracefile_size
;
1809 ua_chan
->tracefile_count
= uchan
->tracefile_count
;
1811 /* Copy event attributes since the layout is different. */
1812 ua_chan
->attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1813 ua_chan
->attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1814 ua_chan
->attr
.overwrite
= uchan
->attr
.overwrite
;
1815 ua_chan
->attr
.switch_timer_interval
= uchan
->attr
.switch_timer_interval
;
1816 ua_chan
->attr
.read_timer_interval
= uchan
->attr
.read_timer_interval
;
1817 ua_chan
->monitor_timer_interval
= uchan
->monitor_timer_interval
;
1818 ua_chan
->attr
.output
= uchan
->attr
.output
;
1819 ua_chan
->attr
.blocking_timeout
= uchan
->attr
.u
.s
.blocking_timeout
;
1822 * Note that the attribute channel type is not set since the channel on the
1823 * tracing registry side does not have this information.
1826 ua_chan
->enabled
= uchan
->enabled
;
1827 ua_chan
->tracing_channel_id
= uchan
->id
;
1829 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
1833 * Copy data between a UST app session and a regular LTT session.
1835 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
1836 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1838 struct tm
*timeinfo
;
1841 char tmp_shm_path
[PATH_MAX
];
1843 timeinfo
= localtime(&app
->registration_time
);
1844 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1846 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1848 ua_sess
->tracing_id
= usess
->id
;
1849 ua_sess
->id
= get_next_session_id();
1850 LTTNG_OPTIONAL_SET(&ua_sess
->real_credentials
.uid
, app
->uid
);
1851 LTTNG_OPTIONAL_SET(&ua_sess
->real_credentials
.gid
, app
->gid
);
1852 LTTNG_OPTIONAL_SET(&ua_sess
->effective_credentials
.uid
, usess
->uid
);
1853 LTTNG_OPTIONAL_SET(&ua_sess
->effective_credentials
.gid
, usess
->gid
);
1854 ua_sess
->buffer_type
= usess
->buffer_type
;
1855 ua_sess
->bits_per_long
= app
->bits_per_long
;
1857 /* There is only one consumer object per session possible. */
1858 consumer_output_get(usess
->consumer
);
1859 ua_sess
->consumer
= usess
->consumer
;
1861 ua_sess
->output_traces
= usess
->output_traces
;
1862 ua_sess
->live_timer_interval
= usess
->live_timer_interval
;
1863 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
,
1864 &usess
->metadata_attr
);
1866 switch (ua_sess
->buffer_type
) {
1867 case LTTNG_BUFFER_PER_PID
:
1868 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1869 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s", app
->name
, app
->pid
,
1872 case LTTNG_BUFFER_PER_UID
:
1873 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1874 DEFAULT_UST_TRACE_UID_PATH
,
1875 lttng_credentials_get_uid(&ua_sess
->real_credentials
),
1876 app
->bits_per_long
);
1883 PERROR("asprintf UST shadow copy session");
1888 strncpy(ua_sess
->root_shm_path
, usess
->root_shm_path
,
1889 sizeof(ua_sess
->root_shm_path
));
1890 ua_sess
->root_shm_path
[sizeof(ua_sess
->root_shm_path
) - 1] = '\0';
1891 strncpy(ua_sess
->shm_path
, usess
->shm_path
,
1892 sizeof(ua_sess
->shm_path
));
1893 ua_sess
->shm_path
[sizeof(ua_sess
->shm_path
) - 1] = '\0';
1894 if (ua_sess
->shm_path
[0]) {
1895 switch (ua_sess
->buffer_type
) {
1896 case LTTNG_BUFFER_PER_PID
:
1897 ret
= snprintf(tmp_shm_path
, sizeof(tmp_shm_path
),
1898 "/" DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s",
1899 app
->name
, app
->pid
, datetime
);
1901 case LTTNG_BUFFER_PER_UID
:
1902 ret
= snprintf(tmp_shm_path
, sizeof(tmp_shm_path
),
1903 "/" DEFAULT_UST_TRACE_UID_PATH
,
1904 app
->uid
, app
->bits_per_long
);
1911 PERROR("sprintf UST shadow copy session");
1915 strncat(ua_sess
->shm_path
, tmp_shm_path
,
1916 sizeof(ua_sess
->shm_path
) - strlen(ua_sess
->shm_path
) - 1);
1917 ua_sess
->shm_path
[sizeof(ua_sess
->shm_path
) - 1] = '\0';
1922 consumer_output_put(ua_sess
->consumer
);
1926 * Lookup sesison wrapper.
1929 void __lookup_session_by_app(const struct ltt_ust_session
*usess
,
1930 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1932 /* Get right UST app session from app */
1933 lttng_ht_lookup(app
->sessions
, &usess
->id
, iter
);
1937 * Return ust app session from the app session hashtable using the UST session
1940 static struct ust_app_session
*lookup_session_by_app(
1941 const struct ltt_ust_session
*usess
, struct ust_app
*app
)
1943 struct lttng_ht_iter iter
;
1944 struct lttng_ht_node_u64
*node
;
1946 __lookup_session_by_app(usess
, app
, &iter
);
1947 node
= lttng_ht_iter_get_node_u64(&iter
);
1952 return caa_container_of(node
, struct ust_app_session
, node
);
1959 * Setup buffer registry per PID for the given session and application. If none
1960 * is found, a new one is created, added to the global registry and
1961 * initialized. If regp is valid, it's set with the newly created object.
1963 * Return 0 on success or else a negative value.
1965 static int setup_buffer_reg_pid(struct ust_app_session
*ua_sess
,
1966 struct ust_app
*app
, struct buffer_reg_pid
**regp
)
1969 struct buffer_reg_pid
*reg_pid
;
1976 reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
1979 * This is the create channel path meaning that if there is NO
1980 * registry available, we have to create one for this session.
1982 ret
= buffer_reg_pid_create(ua_sess
->id
, ®_pid
,
1983 ua_sess
->root_shm_path
, ua_sess
->shm_path
);
1991 /* Initialize registry. */
1992 ret
= ust_registry_session_init(®_pid
->registry
->reg
.ust
, app
,
1993 app
->bits_per_long
, app
->uint8_t_alignment
,
1994 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
1995 app
->uint64_t_alignment
, app
->long_alignment
,
1996 app
->byte_order
, app
->version
.major
, app
->version
.minor
,
1997 reg_pid
->root_shm_path
, reg_pid
->shm_path
,
1998 lttng_credentials_get_uid(&ua_sess
->effective_credentials
),
1999 lttng_credentials_get_gid(&ua_sess
->effective_credentials
),
2000 ua_sess
->tracing_id
,
2004 * reg_pid->registry->reg.ust is NULL upon error, so we need to
2005 * destroy the buffer registry, because it is always expected
2006 * that if the buffer registry can be found, its ust registry is
2009 buffer_reg_pid_destroy(reg_pid
);
2013 buffer_reg_pid_add(reg_pid
);
2015 DBG3("UST app buffer registry per PID created successfully");
2027 * Setup buffer registry per UID for the given session and application. If none
2028 * is found, a new one is created, added to the global registry and
2029 * initialized. If regp is valid, it's set with the newly created object.
2031 * Return 0 on success or else a negative value.
2033 static int setup_buffer_reg_uid(struct ltt_ust_session
*usess
,
2034 struct ust_app_session
*ua_sess
,
2035 struct ust_app
*app
, struct buffer_reg_uid
**regp
)
2038 struct buffer_reg_uid
*reg_uid
;
2045 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2048 * This is the create channel path meaning that if there is NO
2049 * registry available, we have to create one for this session.
2051 ret
= buffer_reg_uid_create(usess
->id
, app
->bits_per_long
, app
->uid
,
2052 LTTNG_DOMAIN_UST
, ®_uid
,
2053 ua_sess
->root_shm_path
, ua_sess
->shm_path
);
2061 /* Initialize registry. */
2062 ret
= ust_registry_session_init(®_uid
->registry
->reg
.ust
, NULL
,
2063 app
->bits_per_long
, app
->uint8_t_alignment
,
2064 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
2065 app
->uint64_t_alignment
, app
->long_alignment
,
2066 app
->byte_order
, app
->version
.major
,
2067 app
->version
.minor
, reg_uid
->root_shm_path
,
2068 reg_uid
->shm_path
, usess
->uid
, usess
->gid
,
2069 ua_sess
->tracing_id
, app
->uid
);
2072 * reg_uid->registry->reg.ust is NULL upon error, so we need to
2073 * destroy the buffer registry, because it is always expected
2074 * that if the buffer registry can be found, its ust registry is
2077 buffer_reg_uid_destroy(reg_uid
, NULL
);
2080 /* Add node to teardown list of the session. */
2081 cds_list_add(®_uid
->lnode
, &usess
->buffer_reg_uid_list
);
2083 buffer_reg_uid_add(reg_uid
);
2085 DBG3("UST app buffer registry per UID created successfully");
2096 * Create a session on the tracer side for the given app.
2098 * On success, ua_sess_ptr is populated with the session pointer or else left
2099 * untouched. If the session was created, is_created is set to 1. On error,
2100 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
2103 * Returns 0 on success or else a negative code which is either -ENOMEM or
2104 * -ENOTCONN which is the default code if the ustctl_create_session fails.
2106 static int find_or_create_ust_app_session(struct ltt_ust_session
*usess
,
2107 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
2110 int ret
, created
= 0;
2111 struct ust_app_session
*ua_sess
;
2115 assert(ua_sess_ptr
);
2117 health_code_update();
2119 ua_sess
= lookup_session_by_app(usess
, app
);
2120 if (ua_sess
== NULL
) {
2121 DBG2("UST app pid: %d session id %" PRIu64
" not found, creating it",
2122 app
->pid
, usess
->id
);
2123 ua_sess
= alloc_ust_app_session();
2124 if (ua_sess
== NULL
) {
2125 /* Only malloc can failed so something is really wrong */
2129 shadow_copy_session(ua_sess
, usess
, app
);
2133 switch (usess
->buffer_type
) {
2134 case LTTNG_BUFFER_PER_PID
:
2135 /* Init local registry. */
2136 ret
= setup_buffer_reg_pid(ua_sess
, app
, NULL
);
2138 delete_ust_app_session(-1, ua_sess
, app
);
2142 case LTTNG_BUFFER_PER_UID
:
2143 /* Look for a global registry. If none exists, create one. */
2144 ret
= setup_buffer_reg_uid(usess
, ua_sess
, app
, NULL
);
2146 delete_ust_app_session(-1, ua_sess
, app
);
2156 health_code_update();
2158 if (ua_sess
->handle
== -1) {
2159 pthread_mutex_lock(&app
->sock_lock
);
2160 ret
= ustctl_create_session(app
->sock
);
2161 pthread_mutex_unlock(&app
->sock_lock
);
2163 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
2164 ERR("Creating session for app pid %d with ret %d",
2167 DBG("UST app creating session failed. Application is dead");
2169 * This is normal behavior, an application can die during the
2170 * creation process. Don't report an error so the execution can
2171 * continue normally. This will get flagged ENOTCONN and the
2172 * caller will handle it.
2176 delete_ust_app_session(-1, ua_sess
, app
);
2177 if (ret
!= -ENOMEM
) {
2179 * Tracer is probably gone or got an internal error so let's
2180 * behave like it will soon unregister or not usable.
2187 ua_sess
->handle
= ret
;
2189 /* Add ust app session to app's HT */
2190 lttng_ht_node_init_u64(&ua_sess
->node
,
2191 ua_sess
->tracing_id
);
2192 lttng_ht_add_unique_u64(app
->sessions
, &ua_sess
->node
);
2193 lttng_ht_node_init_ulong(&ua_sess
->ust_objd_node
, ua_sess
->handle
);
2194 lttng_ht_add_unique_ulong(app
->ust_sessions_objd
,
2195 &ua_sess
->ust_objd_node
);
2197 DBG2("UST app session created successfully with handle %d", ret
);
2200 *ua_sess_ptr
= ua_sess
;
2202 *is_created
= created
;
2205 /* Everything went well. */
2209 health_code_update();
2214 * Match function for a hash table lookup of ust_app_ctx.
2216 * It matches an ust app context based on the context type and, in the case
2217 * of perf counters, their name.
2219 static int ht_match_ust_app_ctx(struct cds_lfht_node
*node
, const void *_key
)
2221 struct ust_app_ctx
*ctx
;
2222 const struct lttng_ust_context_attr
*key
;
2227 ctx
= caa_container_of(node
, struct ust_app_ctx
, node
.node
);
2231 if (ctx
->ctx
.ctx
!= key
->ctx
) {
2236 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
2237 if (strncmp(key
->u
.perf_counter
.name
,
2238 ctx
->ctx
.u
.perf_counter
.name
,
2239 sizeof(key
->u
.perf_counter
.name
))) {
2243 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
2244 if (strcmp(key
->u
.app_ctx
.provider_name
,
2245 ctx
->ctx
.u
.app_ctx
.provider_name
) ||
2246 strcmp(key
->u
.app_ctx
.ctx_name
,
2247 ctx
->ctx
.u
.app_ctx
.ctx_name
)) {
2263 * Lookup for an ust app context from an lttng_ust_context.
2265 * Must be called while holding RCU read side lock.
2266 * Return an ust_app_ctx object or NULL on error.
2269 struct ust_app_ctx
*find_ust_app_context(struct lttng_ht
*ht
,
2270 struct lttng_ust_context_attr
*uctx
)
2272 struct lttng_ht_iter iter
;
2273 struct lttng_ht_node_ulong
*node
;
2274 struct ust_app_ctx
*app_ctx
= NULL
;
2279 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2280 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) uctx
->ctx
, lttng_ht_seed
),
2281 ht_match_ust_app_ctx
, uctx
, &iter
.iter
);
2282 node
= lttng_ht_iter_get_node_ulong(&iter
);
2287 app_ctx
= caa_container_of(node
, struct ust_app_ctx
, node
);
2294 * Create a context for the channel on the tracer.
2296 * Called with UST app session lock held and a RCU read side lock.
2299 int create_ust_app_channel_context(struct ust_app_channel
*ua_chan
,
2300 struct lttng_ust_context_attr
*uctx
,
2301 struct ust_app
*app
)
2304 struct ust_app_ctx
*ua_ctx
;
2306 DBG2("UST app adding context to channel %s", ua_chan
->name
);
2308 ua_ctx
= find_ust_app_context(ua_chan
->ctx
, uctx
);
2314 ua_ctx
= alloc_ust_app_ctx(uctx
);
2315 if (ua_ctx
== NULL
) {
2321 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
2322 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
2323 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
2325 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2335 * Enable on the tracer side a ust app event for the session and channel.
2337 * Called with UST app session lock held.
2340 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
2341 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2345 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
2350 ua_event
->enabled
= 1;
2357 * Disable on the tracer side a ust app event for the session and channel.
2359 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
2360 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2364 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
2369 ua_event
->enabled
= 0;
2376 * Lookup ust app channel for session and disable it on the tracer side.
2379 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
2380 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
2384 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2389 ua_chan
->enabled
= 0;
2396 * Lookup ust app channel for session and enable it on the tracer side. This
2397 * MUST be called with a RCU read side lock acquired.
2399 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
2400 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
2403 struct lttng_ht_iter iter
;
2404 struct lttng_ht_node_str
*ua_chan_node
;
2405 struct ust_app_channel
*ua_chan
;
2407 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2408 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2409 if (ua_chan_node
== NULL
) {
2410 DBG2("Unable to find channel %s in ust session id %" PRIu64
,
2411 uchan
->name
, ua_sess
->tracing_id
);
2415 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2417 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
2427 * Ask the consumer to create a channel and get it if successful.
2429 * Called with UST app session lock held.
2431 * Return 0 on success or else a negative value.
2433 static int do_consumer_create_channel(struct ltt_ust_session
*usess
,
2434 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
2435 int bitness
, struct ust_registry_session
*registry
,
2436 uint64_t trace_archive_id
)
2439 unsigned int nb_fd
= 0;
2440 struct consumer_socket
*socket
;
2448 health_code_update();
2450 /* Get the right consumer socket for the application. */
2451 socket
= consumer_find_socket_by_bitness(bitness
, usess
->consumer
);
2457 health_code_update();
2459 /* Need one fd for the channel. */
2460 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2462 ERR("Exhausted number of available FD upon create channel");
2467 * Ask consumer to create channel. The consumer will return the number of
2468 * stream we have to expect.
2470 ret
= ust_consumer_ask_channel(ua_sess
, ua_chan
, usess
->consumer
, socket
,
2471 registry
, usess
->current_trace_chunk
);
2477 * Compute the number of fd needed before receiving them. It must be 2 per
2478 * stream (2 being the default value here).
2480 nb_fd
= DEFAULT_UST_STREAM_FD_NUM
* ua_chan
->expected_stream_count
;
2482 /* Reserve the amount of file descriptor we need. */
2483 ret
= lttng_fd_get(LTTNG_FD_APPS
, nb_fd
);
2485 ERR("Exhausted number of available FD upon create channel");
2486 goto error_fd_get_stream
;
2489 health_code_update();
2492 * Now get the channel from the consumer. This call wil populate the stream
2493 * list of that channel and set the ust objects.
2495 if (usess
->consumer
->enabled
) {
2496 ret
= ust_consumer_get_channel(socket
, ua_chan
);
2506 lttng_fd_put(LTTNG_FD_APPS
, nb_fd
);
2507 error_fd_get_stream
:
2509 * Initiate a destroy channel on the consumer since we had an error
2510 * handling it on our side. The return value is of no importance since we
2511 * already have a ret value set by the previous error that we need to
2514 (void) ust_consumer_destroy_channel(socket
, ua_chan
);
2516 lttng_fd_put(LTTNG_FD_APPS
, 1);
2518 health_code_update();
2524 * Duplicate the ust data object of the ust app stream and save it in the
2525 * buffer registry stream.
2527 * Return 0 on success or else a negative value.
2529 static int duplicate_stream_object(struct buffer_reg_stream
*reg_stream
,
2530 struct ust_app_stream
*stream
)
2537 /* Reserve the amount of file descriptor we need. */
2538 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2540 ERR("Exhausted number of available FD upon duplicate stream");
2544 /* Duplicate object for stream once the original is in the registry. */
2545 ret
= ustctl_duplicate_ust_object_data(&stream
->obj
,
2546 reg_stream
->obj
.ust
);
2548 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2549 reg_stream
->obj
.ust
, stream
->obj
, ret
);
2550 lttng_fd_put(LTTNG_FD_APPS
, 2);
2553 stream
->handle
= stream
->obj
->handle
;
2560 * Duplicate the ust data object of the ust app. channel and save it in the
2561 * buffer registry channel.
2563 * Return 0 on success or else a negative value.
2565 static int duplicate_channel_object(struct buffer_reg_channel
*reg_chan
,
2566 struct ust_app_channel
*ua_chan
)
2573 /* Need two fds for the channel. */
2574 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2576 ERR("Exhausted number of available FD upon duplicate channel");
2580 /* Duplicate object for stream once the original is in the registry. */
2581 ret
= ustctl_duplicate_ust_object_data(&ua_chan
->obj
, reg_chan
->obj
.ust
);
2583 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2584 reg_chan
->obj
.ust
, ua_chan
->obj
, ret
);
2587 ua_chan
->handle
= ua_chan
->obj
->handle
;
2592 lttng_fd_put(LTTNG_FD_APPS
, 1);
2598 * For a given channel buffer registry, setup all streams of the given ust
2599 * application channel.
2601 * Return 0 on success or else a negative value.
2603 static int setup_buffer_reg_streams(struct buffer_reg_channel
*reg_chan
,
2604 struct ust_app_channel
*ua_chan
,
2605 struct ust_app
*app
)
2608 struct ust_app_stream
*stream
, *stmp
;
2613 DBG2("UST app setup buffer registry stream");
2615 /* Send all streams to application. */
2616 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
2617 struct buffer_reg_stream
*reg_stream
;
2619 ret
= buffer_reg_stream_create(®_stream
);
2625 * Keep original pointer and nullify it in the stream so the delete
2626 * stream call does not release the object.
2628 reg_stream
->obj
.ust
= stream
->obj
;
2630 buffer_reg_stream_add(reg_stream
, reg_chan
);
2632 /* We don't need the streams anymore. */
2633 cds_list_del(&stream
->list
);
2634 delete_ust_app_stream(-1, stream
, app
);
2642 * Create a buffer registry channel for the given session registry and
2643 * application channel object. If regp pointer is valid, it's set with the
2644 * created object. Important, the created object is NOT added to the session
2645 * registry hash table.
2647 * Return 0 on success else a negative value.
2649 static int create_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2650 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
**regp
)
2653 struct buffer_reg_channel
*reg_chan
= NULL
;
2658 DBG2("UST app creating buffer registry channel for %s", ua_chan
->name
);
2660 /* Create buffer registry channel. */
2661 ret
= buffer_reg_channel_create(ua_chan
->tracing_channel_id
, ®_chan
);
2666 reg_chan
->consumer_key
= ua_chan
->key
;
2667 reg_chan
->subbuf_size
= ua_chan
->attr
.subbuf_size
;
2668 reg_chan
->num_subbuf
= ua_chan
->attr
.num_subbuf
;
2670 /* Create and add a channel registry to session. */
2671 ret
= ust_registry_channel_add(reg_sess
->reg
.ust
,
2672 ua_chan
->tracing_channel_id
);
2676 buffer_reg_channel_add(reg_sess
, reg_chan
);
2685 /* Safe because the registry channel object was not added to any HT. */
2686 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2692 * Setup buffer registry channel for the given session registry and application
2693 * channel object. If regp pointer is valid, it's set with the created object.
2695 * Return 0 on success else a negative value.
2697 static int setup_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2698 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
*reg_chan
,
2699 struct ust_app
*app
)
2706 assert(ua_chan
->obj
);
2708 DBG2("UST app setup buffer registry channel for %s", ua_chan
->name
);
2710 /* Setup all streams for the registry. */
2711 ret
= setup_buffer_reg_streams(reg_chan
, ua_chan
, app
);
2716 reg_chan
->obj
.ust
= ua_chan
->obj
;
2717 ua_chan
->obj
= NULL
;
2722 buffer_reg_channel_remove(reg_sess
, reg_chan
);
2723 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2728 * Send buffer registry channel to the application.
2730 * Return 0 on success else a negative value.
2732 static int send_channel_uid_to_ust(struct buffer_reg_channel
*reg_chan
,
2733 struct ust_app
*app
, struct ust_app_session
*ua_sess
,
2734 struct ust_app_channel
*ua_chan
)
2737 struct buffer_reg_stream
*reg_stream
;
2744 DBG("UST app sending buffer registry channel to ust sock %d", app
->sock
);
2746 ret
= duplicate_channel_object(reg_chan
, ua_chan
);
2751 /* Send channel to the application. */
2752 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
2753 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
2754 ret
= -ENOTCONN
; /* Caused by app exiting. */
2756 } else if (ret
< 0) {
2760 health_code_update();
2762 /* Send all streams to application. */
2763 pthread_mutex_lock(®_chan
->stream_list_lock
);
2764 cds_list_for_each_entry(reg_stream
, ®_chan
->streams
, lnode
) {
2765 struct ust_app_stream stream
;
2767 ret
= duplicate_stream_object(reg_stream
, &stream
);
2769 goto error_stream_unlock
;
2772 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, &stream
);
2774 (void) release_ust_app_stream(-1, &stream
, app
);
2775 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
2776 ret
= -ENOTCONN
; /* Caused by app exiting. */
2778 goto error_stream_unlock
;
2782 * The return value is not important here. This function will output an
2785 (void) release_ust_app_stream(-1, &stream
, app
);
2787 ua_chan
->is_sent
= 1;
2789 error_stream_unlock
:
2790 pthread_mutex_unlock(®_chan
->stream_list_lock
);
2796 * Create and send to the application the created buffers with per UID buffers.
2798 * This MUST be called with a RCU read side lock acquired.
2799 * The session list lock and the session's lock must be acquired.
2801 * Return 0 on success else a negative value.
2803 static int create_channel_per_uid(struct ust_app
*app
,
2804 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2805 struct ust_app_channel
*ua_chan
)
2808 struct buffer_reg_uid
*reg_uid
;
2809 struct buffer_reg_channel
*reg_chan
;
2810 struct ltt_session
*session
= NULL
;
2811 enum lttng_error_code notification_ret
;
2812 struct ust_registry_channel
*chan_reg
;
2819 DBG("UST app creating channel %s with per UID buffers", ua_chan
->name
);
2821 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2823 * The session creation handles the creation of this global registry
2824 * object. If none can be find, there is a code flow problem or a
2829 reg_chan
= buffer_reg_channel_find(ua_chan
->tracing_channel_id
,
2835 /* Create the buffer registry channel object. */
2836 ret
= create_buffer_reg_channel(reg_uid
->registry
, ua_chan
, ®_chan
);
2838 ERR("Error creating the UST channel \"%s\" registry instance",
2843 session
= session_find_by_id(ua_sess
->tracing_id
);
2845 assert(pthread_mutex_trylock(&session
->lock
));
2846 assert(session_trylock_list());
2849 * Create the buffers on the consumer side. This call populates the
2850 * ust app channel object with all streams and data object.
2852 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2853 app
->bits_per_long
, reg_uid
->registry
->reg
.ust
,
2854 session
->most_recent_chunk_id
.value
);
2856 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2860 * Let's remove the previously created buffer registry channel so
2861 * it's not visible anymore in the session registry.
2863 ust_registry_channel_del_free(reg_uid
->registry
->reg
.ust
,
2864 ua_chan
->tracing_channel_id
, false);
2865 buffer_reg_channel_remove(reg_uid
->registry
, reg_chan
);
2866 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2871 * Setup the streams and add it to the session registry.
2873 ret
= setup_buffer_reg_channel(reg_uid
->registry
,
2874 ua_chan
, reg_chan
, app
);
2876 ERR("Error setting up UST channel \"%s\"", ua_chan
->name
);
2880 /* Notify the notification subsystem of the channel's creation. */
2881 pthread_mutex_lock(®_uid
->registry
->reg
.ust
->lock
);
2882 chan_reg
= ust_registry_channel_find(reg_uid
->registry
->reg
.ust
,
2883 ua_chan
->tracing_channel_id
);
2885 chan_reg
->consumer_key
= ua_chan
->key
;
2887 pthread_mutex_unlock(®_uid
->registry
->reg
.ust
->lock
);
2889 notification_ret
= notification_thread_command_add_channel(
2890 notification_thread_handle
, session
->name
,
2891 lttng_credentials_get_uid(&ua_sess
->effective_credentials
),
2892 lttng_credentials_get_gid(&ua_sess
->effective_credentials
),
2894 ua_chan
->key
, LTTNG_DOMAIN_UST
,
2895 ua_chan
->attr
.subbuf_size
* ua_chan
->attr
.num_subbuf
);
2896 if (notification_ret
!= LTTNG_OK
) {
2897 ret
= - (int) notification_ret
;
2898 ERR("Failed to add channel to notification thread");
2903 /* Send buffers to the application. */
2904 ret
= send_channel_uid_to_ust(reg_chan
, app
, ua_sess
, ua_chan
);
2906 if (ret
!= -ENOTCONN
) {
2907 ERR("Error sending channel to application");
2914 session_put(session
);
2920 * Create and send to the application the created buffers with per PID buffers.
2922 * Called with UST app session lock held.
2923 * The session list lock and the session's lock must be acquired.
2925 * Return 0 on success else a negative value.
2927 static int create_channel_per_pid(struct ust_app
*app
,
2928 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2929 struct ust_app_channel
*ua_chan
)
2932 struct ust_registry_session
*registry
;
2933 enum lttng_error_code cmd_ret
;
2934 struct ltt_session
*session
= NULL
;
2935 uint64_t chan_reg_key
;
2936 struct ust_registry_channel
*chan_reg
;
2943 DBG("UST app creating channel %s with per PID buffers", ua_chan
->name
);
2947 registry
= get_session_registry(ua_sess
);
2948 /* The UST app session lock is held, registry shall not be null. */
2951 /* Create and add a new channel registry to session. */
2952 ret
= ust_registry_channel_add(registry
, ua_chan
->key
);
2954 ERR("Error creating the UST channel \"%s\" registry instance",
2959 session
= session_find_by_id(ua_sess
->tracing_id
);
2962 assert(pthread_mutex_trylock(&session
->lock
));
2963 assert(session_trylock_list());
2965 /* Create and get channel on the consumer side. */
2966 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2967 app
->bits_per_long
, registry
,
2968 session
->most_recent_chunk_id
.value
);
2970 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2972 goto error_remove_from_registry
;
2975 ret
= send_channel_pid_to_ust(app
, ua_sess
, ua_chan
);
2977 if (ret
!= -ENOTCONN
) {
2978 ERR("Error sending channel to application");
2980 goto error_remove_from_registry
;
2983 chan_reg_key
= ua_chan
->key
;
2984 pthread_mutex_lock(®istry
->lock
);
2985 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
2987 chan_reg
->consumer_key
= ua_chan
->key
;
2988 pthread_mutex_unlock(®istry
->lock
);
2990 cmd_ret
= notification_thread_command_add_channel(
2991 notification_thread_handle
, session
->name
,
2992 lttng_credentials_get_uid(&ua_sess
->effective_credentials
),
2993 lttng_credentials_get_gid(&ua_sess
->effective_credentials
),
2995 ua_chan
->key
, LTTNG_DOMAIN_UST
,
2996 ua_chan
->attr
.subbuf_size
* ua_chan
->attr
.num_subbuf
);
2997 if (cmd_ret
!= LTTNG_OK
) {
2998 ret
= - (int) cmd_ret
;
2999 ERR("Failed to add channel to notification thread");
3000 goto error_remove_from_registry
;
3003 error_remove_from_registry
:
3005 ust_registry_channel_del_free(registry
, ua_chan
->key
, false);
3010 session_put(session
);
3016 * From an already allocated ust app channel, create the channel buffers if
3017 * needed and send them to the application. This MUST be called with a RCU read
3018 * side lock acquired.
3020 * Called with UST app session lock held.
3022 * Return 0 on success or else a negative value. Returns -ENOTCONN if
3023 * the application exited concurrently.
3025 static int ust_app_channel_send(struct ust_app
*app
,
3026 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
3027 struct ust_app_channel
*ua_chan
)
3033 assert(usess
->active
);
3037 /* Handle buffer type before sending the channel to the application. */
3038 switch (usess
->buffer_type
) {
3039 case LTTNG_BUFFER_PER_UID
:
3041 ret
= create_channel_per_uid(app
, usess
, ua_sess
, ua_chan
);
3047 case LTTNG_BUFFER_PER_PID
:
3049 ret
= create_channel_per_pid(app
, usess
, ua_sess
, ua_chan
);
3061 /* Initialize ust objd object using the received handle and add it. */
3062 lttng_ht_node_init_ulong(&ua_chan
->ust_objd_node
, ua_chan
->handle
);
3063 lttng_ht_add_unique_ulong(app
->ust_objd
, &ua_chan
->ust_objd_node
);
3065 /* If channel is not enabled, disable it on the tracer */
3066 if (!ua_chan
->enabled
) {
3067 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
3078 * Create UST app channel and return it through ua_chanp if not NULL.
3080 * Called with UST app session lock and RCU read-side lock held.
3082 * Return 0 on success or else a negative value.
3084 static int ust_app_channel_allocate(struct ust_app_session
*ua_sess
,
3085 struct ltt_ust_channel
*uchan
,
3086 enum lttng_ust_chan_type type
, struct ltt_ust_session
*usess
,
3087 struct ust_app_channel
**ua_chanp
)
3090 struct lttng_ht_iter iter
;
3091 struct lttng_ht_node_str
*ua_chan_node
;
3092 struct ust_app_channel
*ua_chan
;
3094 /* Lookup channel in the ust app session */
3095 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
3096 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
3097 if (ua_chan_node
!= NULL
) {
3098 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3102 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
3103 if (ua_chan
== NULL
) {
3104 /* Only malloc can fail here */
3108 shadow_copy_channel(ua_chan
, uchan
);
3110 /* Set channel type. */
3111 ua_chan
->attr
.type
= type
;
3113 /* Only add the channel if successful on the tracer side. */
3114 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
3117 *ua_chanp
= ua_chan
;
3120 /* Everything went well. */
3128 * Create UST app event and create it on the tracer side.
3130 * Called with ust app session mutex held.
3133 int create_ust_app_event(struct ust_app_session
*ua_sess
,
3134 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
3135 struct ust_app
*app
)
3138 struct ust_app_event
*ua_event
;
3140 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
3141 if (ua_event
== NULL
) {
3142 /* Only failure mode of alloc_ust_app_event(). */
3146 shadow_copy_event(ua_event
, uevent
);
3148 /* Create it on the tracer side */
3149 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
3152 * Not found previously means that it does not exist on the
3153 * tracer. If the application reports that the event existed,
3154 * it means there is a bug in the sessiond or lttng-ust
3155 * (or corruption, etc.)
3157 if (ret
== -LTTNG_UST_ERR_EXIST
) {
3158 ERR("Tracer for application reported that an event being created already existed: "
3159 "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d",
3161 app
->pid
, app
->ppid
, app
->uid
,
3167 add_unique_ust_app_event(ua_chan
, ua_event
);
3169 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
3176 /* Valid. Calling here is already in a read side lock */
3177 delete_ust_app_event(-1, ua_event
, app
);
3182 * Create UST metadata and open it on the tracer side.
3184 * Called with UST app session lock held and RCU read side lock.
3186 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
3187 struct ust_app
*app
, struct consumer_output
*consumer
)
3190 struct ust_app_channel
*metadata
;
3191 struct consumer_socket
*socket
;
3192 struct ust_registry_session
*registry
;
3193 struct ltt_session
*session
= NULL
;
3199 registry
= get_session_registry(ua_sess
);
3200 /* The UST app session is held registry shall not be null. */
3203 pthread_mutex_lock(®istry
->lock
);
3205 /* Metadata already exists for this registry or it was closed previously */
3206 if (registry
->metadata_key
|| registry
->metadata_closed
) {
3211 /* Allocate UST metadata */
3212 metadata
= alloc_ust_app_channel(DEFAULT_METADATA_NAME
, ua_sess
, NULL
);
3214 /* malloc() failed */
3219 memcpy(&metadata
->attr
, &ua_sess
->metadata_attr
, sizeof(metadata
->attr
));
3221 /* Need one fd for the channel. */
3222 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
3224 ERR("Exhausted number of available FD upon create metadata");
3228 /* Get the right consumer socket for the application. */
3229 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
, consumer
);
3232 goto error_consumer
;
3236 * Keep metadata key so we can identify it on the consumer side. Assign it
3237 * to the registry *before* we ask the consumer so we avoid the race of the
3238 * consumer requesting the metadata and the ask_channel call on our side
3239 * did not returned yet.
3241 registry
->metadata_key
= metadata
->key
;
3243 session
= session_find_by_id(ua_sess
->tracing_id
);
3246 assert(pthread_mutex_trylock(&session
->lock
));
3247 assert(session_trylock_list());
3250 * Ask the metadata channel creation to the consumer. The metadata object
3251 * will be created by the consumer and kept their. However, the stream is
3252 * never added or monitored until we do a first push metadata to the
3255 ret
= ust_consumer_ask_channel(ua_sess
, metadata
, consumer
, socket
,
3256 registry
, session
->current_trace_chunk
);
3258 /* Nullify the metadata key so we don't try to close it later on. */
3259 registry
->metadata_key
= 0;
3260 goto error_consumer
;
3264 * The setup command will make the metadata stream be sent to the relayd,
3265 * if applicable, and the thread managing the metadatas. This is important
3266 * because after this point, if an error occurs, the only way the stream
3267 * can be deleted is to be monitored in the consumer.
3269 ret
= consumer_setup_metadata(socket
, metadata
->key
);
3271 /* Nullify the metadata key so we don't try to close it later on. */
3272 registry
->metadata_key
= 0;
3273 goto error_consumer
;
3276 DBG2("UST metadata with key %" PRIu64
" created for app pid %d",
3277 metadata
->key
, app
->pid
);
3280 lttng_fd_put(LTTNG_FD_APPS
, 1);
3281 delete_ust_app_channel(-1, metadata
, app
);
3283 pthread_mutex_unlock(®istry
->lock
);
3285 session_put(session
);
3291 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
3292 * acquired before calling this function.
3294 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
3296 struct ust_app
*app
= NULL
;
3297 struct lttng_ht_node_ulong
*node
;
3298 struct lttng_ht_iter iter
;
3300 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
3301 node
= lttng_ht_iter_get_node_ulong(&iter
);
3303 DBG2("UST app no found with pid %d", pid
);
3307 DBG2("Found UST app by pid %d", pid
);
3309 app
= caa_container_of(node
, struct ust_app
, pid_n
);
3316 * Allocate and init an UST app object using the registration information and
3317 * the command socket. This is called when the command socket connects to the
3320 * The object is returned on success or else NULL.
3322 struct ust_app
*ust_app_create(struct ust_register_msg
*msg
, int sock
)
3324 struct ust_app
*lta
= NULL
;
3329 DBG3("UST app creating application for socket %d", sock
);
3331 if ((msg
->bits_per_long
== 64 &&
3332 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
3333 || (msg
->bits_per_long
== 32 &&
3334 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
3335 ERR("Registration failed: application \"%s\" (pid: %d) has "
3336 "%d-bit long, but no consumerd for this size is available.\n",
3337 msg
->name
, msg
->pid
, msg
->bits_per_long
);
3341 lta
= zmalloc(sizeof(struct ust_app
));
3347 lta
->ppid
= msg
->ppid
;
3348 lta
->uid
= msg
->uid
;
3349 lta
->gid
= msg
->gid
;
3351 lta
->bits_per_long
= msg
->bits_per_long
;
3352 lta
->uint8_t_alignment
= msg
->uint8_t_alignment
;
3353 lta
->uint16_t_alignment
= msg
->uint16_t_alignment
;
3354 lta
->uint32_t_alignment
= msg
->uint32_t_alignment
;
3355 lta
->uint64_t_alignment
= msg
->uint64_t_alignment
;
3356 lta
->long_alignment
= msg
->long_alignment
;
3357 lta
->byte_order
= msg
->byte_order
;
3359 lta
->v_major
= msg
->major
;
3360 lta
->v_minor
= msg
->minor
;
3361 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3362 lta
->ust_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3363 lta
->ust_sessions_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3364 lta
->notify_sock
= -1;
3366 /* Copy name and make sure it's NULL terminated. */
3367 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
3368 lta
->name
[UST_APP_PROCNAME_LEN
] = '\0';
3371 * Before this can be called, when receiving the registration information,
3372 * the application compatibility is checked. So, at this point, the
3373 * application can work with this session daemon.
3375 lta
->compatible
= 1;
3377 lta
->pid
= msg
->pid
;
3378 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long) lta
->pid
);
3380 pthread_mutex_init(<a
->sock_lock
, NULL
);
3381 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long) lta
->sock
);
3383 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
3389 * For a given application object, add it to every hash table.
3391 void ust_app_add(struct ust_app
*app
)
3394 assert(app
->notify_sock
>= 0);
3396 app
->registration_time
= time(NULL
);
3401 * On a re-registration, we want to kick out the previous registration of
3404 lttng_ht_add_replace_ulong(ust_app_ht
, &app
->pid_n
);
3407 * The socket _should_ be unique until _we_ call close. So, a add_unique
3408 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3409 * already in the table.
3411 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, &app
->sock_n
);
3413 /* Add application to the notify socket hash table. */
3414 lttng_ht_node_init_ulong(&app
->notify_sock_n
, app
->notify_sock
);
3415 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock
, &app
->notify_sock_n
);
3417 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
3418 "notify_sock:%d (version %d.%d)", app
->pid
, app
->ppid
, app
->uid
,
3419 app
->gid
, app
->sock
, app
->name
, app
->notify_sock
, app
->v_major
,
3426 * Set the application version into the object.
3428 * Return 0 on success else a negative value either an errno code or a
3429 * LTTng-UST error code.
3431 int ust_app_version(struct ust_app
*app
)
3437 pthread_mutex_lock(&app
->sock_lock
);
3438 ret
= ustctl_tracer_version(app
->sock
, &app
->version
);
3439 pthread_mutex_unlock(&app
->sock_lock
);
3441 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3442 ERR("UST app %d version failed with ret %d", app
->sock
, ret
);
3444 DBG3("UST app %d version failed. Application is dead", app
->sock
);
3452 * Unregister app by removing it from the global traceable app list and freeing
3455 * The socket is already closed at this point so no close to sock.
3457 void ust_app_unregister(int sock
)
3459 struct ust_app
*lta
;
3460 struct lttng_ht_node_ulong
*node
;
3461 struct lttng_ht_iter ust_app_sock_iter
;
3462 struct lttng_ht_iter iter
;
3463 struct ust_app_session
*ua_sess
;
3468 /* Get the node reference for a call_rcu */
3469 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &ust_app_sock_iter
);
3470 node
= lttng_ht_iter_get_node_ulong(&ust_app_sock_iter
);
3473 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
3474 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
3477 * For per-PID buffers, perform "push metadata" and flush all
3478 * application streams before removing app from hash tables,
3479 * ensuring proper behavior of data_pending check.
3480 * Remove sessions so they are not visible during deletion.
3482 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
3484 struct ust_registry_session
*registry
;
3486 ret
= lttng_ht_del(lta
->sessions
, &iter
);
3488 /* The session was already removed so scheduled for teardown. */
3492 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
3493 (void) ust_app_flush_app_session(lta
, ua_sess
);
3497 * Add session to list for teardown. This is safe since at this point we
3498 * are the only one using this list.
3500 pthread_mutex_lock(&ua_sess
->lock
);
3502 if (ua_sess
->deleted
) {
3503 pthread_mutex_unlock(&ua_sess
->lock
);
3508 * Normally, this is done in the delete session process which is
3509 * executed in the call rcu below. However, upon registration we can't
3510 * afford to wait for the grace period before pushing data or else the
3511 * data pending feature can race between the unregistration and stop
3512 * command where the data pending command is sent *before* the grace
3515 * The close metadata below nullifies the metadata pointer in the
3516 * session so the delete session will NOT push/close a second time.
3518 registry
= get_session_registry(ua_sess
);
3520 /* Push metadata for application before freeing the application. */
3521 (void) push_metadata(registry
, ua_sess
->consumer
);
3524 * Don't ask to close metadata for global per UID buffers. Close
3525 * metadata only on destroy trace session in this case. Also, the
3526 * previous push metadata could have flag the metadata registry to
3527 * close so don't send a close command if closed.
3529 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
3530 /* And ask to close it for this session registry. */
3531 (void) close_metadata(registry
, ua_sess
->consumer
);
3534 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
3536 pthread_mutex_unlock(&ua_sess
->lock
);
3539 /* Remove application from PID hash table */
3540 ret
= lttng_ht_del(ust_app_ht_by_sock
, &ust_app_sock_iter
);
3544 * Remove application from notify hash table. The thread handling the
3545 * notify socket could have deleted the node so ignore on error because
3546 * either way it's valid. The close of that socket is handled by the
3547 * apps_notify_thread.
3549 iter
.iter
.node
= <a
->notify_sock_n
.node
;
3550 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3553 * Ignore return value since the node might have been removed before by an
3554 * add replace during app registration because the PID can be reassigned by
3557 iter
.iter
.node
= <a
->pid_n
.node
;
3558 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3560 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3565 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
3572 * Fill events array with all events name of all registered apps.
3574 int ust_app_list_events(struct lttng_event
**events
)
3577 size_t nbmem
, count
= 0;
3578 struct lttng_ht_iter iter
;
3579 struct ust_app
*app
;
3580 struct lttng_event
*tmp_event
;
3582 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3583 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
3584 if (tmp_event
== NULL
) {
3585 PERROR("zmalloc ust app events");
3592 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3593 struct lttng_ust_tracepoint_iter uiter
;
3595 health_code_update();
3597 if (!app
->compatible
) {
3599 * TODO: In time, we should notice the caller of this error by
3600 * telling him that this is a version error.
3604 pthread_mutex_lock(&app
->sock_lock
);
3605 handle
= ustctl_tracepoint_list(app
->sock
);
3607 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3608 ERR("UST app list events getting handle failed for app pid %d",
3611 pthread_mutex_unlock(&app
->sock_lock
);
3615 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
3616 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3617 /* Handle ustctl error. */
3621 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3622 ERR("UST app tp list get failed for app %d with ret %d",
3625 DBG3("UST app tp list get failed. Application is dead");
3627 * This is normal behavior, an application can die during the
3628 * creation process. Don't report an error so the execution can
3629 * continue normally. Continue normal execution.
3634 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3635 if (release_ret
< 0 &&
3636 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3637 release_ret
!= -EPIPE
) {
3638 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3640 pthread_mutex_unlock(&app
->sock_lock
);
3644 health_code_update();
3645 if (count
>= nbmem
) {
3646 /* In case the realloc fails, we free the memory */
3647 struct lttng_event
*new_tmp_event
;
3650 new_nbmem
= nbmem
<< 1;
3651 DBG2("Reallocating event list from %zu to %zu entries",
3653 new_tmp_event
= realloc(tmp_event
,
3654 new_nbmem
* sizeof(struct lttng_event
));
3655 if (new_tmp_event
== NULL
) {
3658 PERROR("realloc ust app events");
3661 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3662 if (release_ret
< 0 &&
3663 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3664 release_ret
!= -EPIPE
) {
3665 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3667 pthread_mutex_unlock(&app
->sock_lock
);
3670 /* Zero the new memory */
3671 memset(new_tmp_event
+ nbmem
, 0,
3672 (new_nbmem
- nbmem
) * sizeof(struct lttng_event
));
3674 tmp_event
= new_tmp_event
;
3676 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
3677 tmp_event
[count
].loglevel
= uiter
.loglevel
;
3678 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
3679 tmp_event
[count
].pid
= app
->pid
;
3680 tmp_event
[count
].enabled
= -1;
3683 ret
= ustctl_release_handle(app
->sock
, handle
);
3684 pthread_mutex_unlock(&app
->sock_lock
);
3685 if (ret
< 0 && ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3686 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, ret
);
3691 *events
= tmp_event
;
3693 DBG2("UST app list events done (%zu events)", count
);
3698 health_code_update();
3703 * Fill events array with all events name of all registered apps.
3705 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
3708 size_t nbmem
, count
= 0;
3709 struct lttng_ht_iter iter
;
3710 struct ust_app
*app
;
3711 struct lttng_event_field
*tmp_event
;
3713 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3714 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
3715 if (tmp_event
== NULL
) {
3716 PERROR("zmalloc ust app event fields");
3723 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3724 struct lttng_ust_field_iter uiter
;
3726 health_code_update();
3728 if (!app
->compatible
) {
3730 * TODO: In time, we should notice the caller of this error by
3731 * telling him that this is a version error.
3735 pthread_mutex_lock(&app
->sock_lock
);
3736 handle
= ustctl_tracepoint_field_list(app
->sock
);
3738 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3739 ERR("UST app list field getting handle failed for app pid %d",
3742 pthread_mutex_unlock(&app
->sock_lock
);
3746 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
3747 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3748 /* Handle ustctl error. */
3752 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3753 ERR("UST app tp list field failed for app %d with ret %d",
3756 DBG3("UST app tp list field failed. Application is dead");
3758 * This is normal behavior, an application can die during the
3759 * creation process. Don't report an error so the execution can
3760 * continue normally. Reset list and count for next app.
3765 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3766 pthread_mutex_unlock(&app
->sock_lock
);
3767 if (release_ret
< 0 &&
3768 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3769 release_ret
!= -EPIPE
) {
3770 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3775 health_code_update();
3776 if (count
>= nbmem
) {
3777 /* In case the realloc fails, we free the memory */
3778 struct lttng_event_field
*new_tmp_event
;
3781 new_nbmem
= nbmem
<< 1;
3782 DBG2("Reallocating event field list from %zu to %zu entries",
3784 new_tmp_event
= realloc(tmp_event
,
3785 new_nbmem
* sizeof(struct lttng_event_field
));
3786 if (new_tmp_event
== NULL
) {
3789 PERROR("realloc ust app event fields");
3792 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3793 pthread_mutex_unlock(&app
->sock_lock
);
3795 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3796 release_ret
!= -EPIPE
) {
3797 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3801 /* Zero the new memory */
3802 memset(new_tmp_event
+ nbmem
, 0,
3803 (new_nbmem
- nbmem
) * sizeof(struct lttng_event_field
));
3805 tmp_event
= new_tmp_event
;
3808 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
3809 /* Mapping between these enums matches 1 to 1. */
3810 tmp_event
[count
].type
= (enum lttng_event_field_type
) uiter
.type
;
3811 tmp_event
[count
].nowrite
= uiter
.nowrite
;
3813 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
3814 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
3815 tmp_event
[count
].event
.type
= LTTNG_EVENT_TRACEPOINT
;
3816 tmp_event
[count
].event
.pid
= app
->pid
;
3817 tmp_event
[count
].event
.enabled
= -1;
3820 ret
= ustctl_release_handle(app
->sock
, handle
);
3821 pthread_mutex_unlock(&app
->sock_lock
);
3823 ret
!= -LTTNG_UST_ERR_EXITING
&&
3825 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, ret
);
3830 *fields
= tmp_event
;
3832 DBG2("UST app list event fields done (%zu events)", count
);
3837 health_code_update();
3842 * Free and clean all traceable apps of the global list.
3844 * Should _NOT_ be called with RCU read-side lock held.
3846 void ust_app_clean_list(void)
3849 struct ust_app
*app
;
3850 struct lttng_ht_iter iter
;
3852 DBG2("UST app cleaning registered apps hash table");
3856 /* Cleanup notify socket hash table */
3857 if (ust_app_ht_by_notify_sock
) {
3858 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock
->ht
, &iter
.iter
, app
,
3859 notify_sock_n
.node
) {
3860 struct cds_lfht_node
*node
;
3861 struct ust_app
*app
;
3863 node
= cds_lfht_iter_get_node(&iter
.iter
);
3868 app
= container_of(node
, struct ust_app
,
3869 notify_sock_n
.node
);
3870 ust_app_notify_sock_unregister(app
->notify_sock
);
3875 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3876 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3878 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
3882 /* Cleanup socket hash table */
3883 if (ust_app_ht_by_sock
) {
3884 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
3886 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3893 /* Destroy is done only when the ht is empty */
3895 ht_cleanup_push(ust_app_ht
);
3897 if (ust_app_ht_by_sock
) {
3898 ht_cleanup_push(ust_app_ht_by_sock
);
3900 if (ust_app_ht_by_notify_sock
) {
3901 ht_cleanup_push(ust_app_ht_by_notify_sock
);
3906 * Init UST app hash table.
3908 int ust_app_ht_alloc(void)
3910 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3914 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3915 if (!ust_app_ht_by_sock
) {
3918 ust_app_ht_by_notify_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3919 if (!ust_app_ht_by_notify_sock
) {
3926 * For a specific UST session, disable the channel for all registered apps.
3928 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
3929 struct ltt_ust_channel
*uchan
)
3932 struct lttng_ht_iter iter
;
3933 struct lttng_ht_node_str
*ua_chan_node
;
3934 struct ust_app
*app
;
3935 struct ust_app_session
*ua_sess
;
3936 struct ust_app_channel
*ua_chan
;
3938 assert(usess
->active
);
3939 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64
,
3940 uchan
->name
, usess
->id
);
3944 /* For every registered applications */
3945 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3946 struct lttng_ht_iter uiter
;
3947 if (!app
->compatible
) {
3949 * TODO: In time, we should notice the caller of this error by
3950 * telling him that this is a version error.
3954 ua_sess
= lookup_session_by_app(usess
, app
);
3955 if (ua_sess
== NULL
) {
3960 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3961 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3962 /* If the session if found for the app, the channel must be there */
3963 assert(ua_chan_node
);
3965 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3966 /* The channel must not be already disabled */
3967 assert(ua_chan
->enabled
== 1);
3969 /* Disable channel onto application */
3970 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
3972 /* XXX: We might want to report this error at some point... */
3982 * For a specific UST session, enable the channel for all registered apps.
3984 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
3985 struct ltt_ust_channel
*uchan
)
3988 struct lttng_ht_iter iter
;
3989 struct ust_app
*app
;
3990 struct ust_app_session
*ua_sess
;
3992 assert(usess
->active
);
3993 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64
,
3994 uchan
->name
, usess
->id
);
3998 /* For every registered applications */
3999 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4000 if (!app
->compatible
) {
4002 * TODO: In time, we should notice the caller of this error by
4003 * telling him that this is a version error.
4007 ua_sess
= lookup_session_by_app(usess
, app
);
4008 if (ua_sess
== NULL
) {
4012 /* Enable channel onto application */
4013 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
4015 /* XXX: We might want to report this error at some point... */
4025 * Disable an event in a channel and for a specific session.
4027 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
4028 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4031 struct lttng_ht_iter iter
, uiter
;
4032 struct lttng_ht_node_str
*ua_chan_node
;
4033 struct ust_app
*app
;
4034 struct ust_app_session
*ua_sess
;
4035 struct ust_app_channel
*ua_chan
;
4036 struct ust_app_event
*ua_event
;
4038 assert(usess
->active
);
4039 DBG("UST app disabling event %s for all apps in channel "
4040 "%s for session id %" PRIu64
,
4041 uevent
->attr
.name
, uchan
->name
, usess
->id
);
4045 /* For all registered applications */
4046 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4047 if (!app
->compatible
) {
4049 * TODO: In time, we should notice the caller of this error by
4050 * telling him that this is a version error.
4054 ua_sess
= lookup_session_by_app(usess
, app
);
4055 if (ua_sess
== NULL
) {
4060 /* Lookup channel in the ust app session */
4061 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4062 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4063 if (ua_chan_node
== NULL
) {
4064 DBG2("Channel %s not found in session id %" PRIu64
" for app pid %d."
4065 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
4068 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4070 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4071 uevent
->filter
, uevent
->attr
.loglevel
,
4073 if (ua_event
== NULL
) {
4074 DBG2("Event %s not found in channel %s for app pid %d."
4075 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
4079 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
4081 /* XXX: Report error someday... */
4090 /* The ua_sess lock must be held by the caller. */
4092 int ust_app_channel_create(struct ltt_ust_session
*usess
,
4093 struct ust_app_session
*ua_sess
,
4094 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
4095 struct ust_app_channel
**_ua_chan
)
4098 struct ust_app_channel
*ua_chan
= NULL
;
4101 ASSERT_LOCKED(ua_sess
->lock
);
4103 if (!strncmp(uchan
->name
, DEFAULT_METADATA_NAME
,
4104 sizeof(uchan
->name
))) {
4105 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
,
4109 struct ltt_ust_context
*uctx
= NULL
;
4112 * Create channel onto application and synchronize its
4115 ret
= ust_app_channel_allocate(ua_sess
, uchan
,
4116 LTTNG_UST_CHAN_PER_CPU
, usess
,
4122 ret
= ust_app_channel_send(app
, usess
,
4129 cds_list_for_each_entry(uctx
, &uchan
->ctx_list
, list
) {
4130 ret
= create_ust_app_channel_context(ua_chan
,
4143 * The application's socket is not valid. Either a bad socket
4144 * or a timeout on it. We can't inform the caller that for a
4145 * specific app, the session failed so lets continue here.
4147 ret
= 0; /* Not an error. */
4155 if (ret
== 0 && _ua_chan
) {
4157 * Only return the application's channel on success. Note
4158 * that the channel can still be part of the application's
4159 * channel hashtable on error.
4161 *_ua_chan
= ua_chan
;
4167 * Enable event for a specific session and channel on the tracer.
4169 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
4170 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4173 struct lttng_ht_iter iter
, uiter
;
4174 struct lttng_ht_node_str
*ua_chan_node
;
4175 struct ust_app
*app
;
4176 struct ust_app_session
*ua_sess
;
4177 struct ust_app_channel
*ua_chan
;
4178 struct ust_app_event
*ua_event
;
4180 assert(usess
->active
);
4181 DBG("UST app enabling event %s for all apps for session id %" PRIu64
,
4182 uevent
->attr
.name
, usess
->id
);
4185 * NOTE: At this point, this function is called only if the session and
4186 * channel passed are already created for all apps. and enabled on the
4192 /* For all registered applications */
4193 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4194 if (!app
->compatible
) {
4196 * TODO: In time, we should notice the caller of this error by
4197 * telling him that this is a version error.
4201 ua_sess
= lookup_session_by_app(usess
, app
);
4203 /* The application has problem or is probably dead. */
4207 pthread_mutex_lock(&ua_sess
->lock
);
4209 if (ua_sess
->deleted
) {
4210 pthread_mutex_unlock(&ua_sess
->lock
);
4214 /* Lookup channel in the ust app session */
4215 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4216 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4218 * It is possible that the channel cannot be found is
4219 * the channel/event creation occurs concurrently with
4220 * an application exit.
4222 if (!ua_chan_node
) {
4223 pthread_mutex_unlock(&ua_sess
->lock
);
4227 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4229 /* Get event node */
4230 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4231 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
4232 if (ua_event
== NULL
) {
4233 DBG3("UST app enable event %s not found for app PID %d."
4234 "Skipping app", uevent
->attr
.name
, app
->pid
);
4238 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
4240 pthread_mutex_unlock(&ua_sess
->lock
);
4244 pthread_mutex_unlock(&ua_sess
->lock
);
4253 * For a specific existing UST session and UST channel, creates the event for
4254 * all registered apps.
4256 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
4257 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4260 struct lttng_ht_iter iter
, uiter
;
4261 struct lttng_ht_node_str
*ua_chan_node
;
4262 struct ust_app
*app
;
4263 struct ust_app_session
*ua_sess
;
4264 struct ust_app_channel
*ua_chan
;
4266 assert(usess
->active
);
4267 DBG("UST app creating event %s for all apps for session id %" PRIu64
,
4268 uevent
->attr
.name
, usess
->id
);
4272 /* For all registered applications */
4273 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4274 if (!app
->compatible
) {
4276 * TODO: In time, we should notice the caller of this error by
4277 * telling him that this is a version error.
4281 ua_sess
= lookup_session_by_app(usess
, app
);
4283 /* The application has problem or is probably dead. */
4287 pthread_mutex_lock(&ua_sess
->lock
);
4289 if (ua_sess
->deleted
) {
4290 pthread_mutex_unlock(&ua_sess
->lock
);
4294 /* Lookup channel in the ust app session */
4295 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4296 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4297 /* If the channel is not found, there is a code flow error */
4298 assert(ua_chan_node
);
4300 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4302 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
4303 pthread_mutex_unlock(&ua_sess
->lock
);
4305 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
4306 /* Possible value at this point: -ENOMEM. If so, we stop! */
4309 DBG2("UST app event %s already exist on app PID %d",
4310 uevent
->attr
.name
, app
->pid
);
4320 * Start tracing for a specific UST session and app.
4322 * Called with UST app session lock held.
4326 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4329 struct ust_app_session
*ua_sess
;
4331 DBG("Starting tracing for ust app pid %d", app
->pid
);
4335 if (!app
->compatible
) {
4339 ua_sess
= lookup_session_by_app(usess
, app
);
4340 if (ua_sess
== NULL
) {
4341 /* The session is in teardown process. Ignore and continue. */
4345 pthread_mutex_lock(&ua_sess
->lock
);
4347 if (ua_sess
->deleted
) {
4348 pthread_mutex_unlock(&ua_sess
->lock
);
4352 if (ua_sess
->enabled
) {
4353 pthread_mutex_unlock(&ua_sess
->lock
);
4357 /* Upon restart, we skip the setup, already done */
4358 if (ua_sess
->started
) {
4363 * Create the metadata for the application. This returns gracefully if a
4364 * metadata was already set for the session.
4366 ret
= create_ust_app_metadata(ua_sess
, app
, usess
->consumer
);
4371 health_code_update();
4374 /* This starts the UST tracing */
4375 pthread_mutex_lock(&app
->sock_lock
);
4376 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
4377 pthread_mutex_unlock(&app
->sock_lock
);
4379 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4380 ERR("Error starting tracing for app pid: %d (ret: %d)",
4383 DBG("UST app start session failed. Application is dead.");
4385 * This is normal behavior, an application can die during the
4386 * creation process. Don't report an error so the execution can
4387 * continue normally.
4389 pthread_mutex_unlock(&ua_sess
->lock
);
4395 /* Indicate that the session has been started once */
4396 ua_sess
->started
= 1;
4397 ua_sess
->enabled
= 1;
4399 pthread_mutex_unlock(&ua_sess
->lock
);
4401 health_code_update();
4403 /* Quiescent wait after starting trace */
4404 pthread_mutex_lock(&app
->sock_lock
);
4405 ret
= ustctl_wait_quiescent(app
->sock
);
4406 pthread_mutex_unlock(&app
->sock_lock
);
4407 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4408 ERR("UST app wait quiescent failed for app pid %d ret %d",
4414 health_code_update();
4418 pthread_mutex_unlock(&ua_sess
->lock
);
4420 health_code_update();
4425 * Stop tracing for a specific UST session and app.
4428 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4431 struct ust_app_session
*ua_sess
;
4432 struct ust_registry_session
*registry
;
4434 DBG("Stopping tracing for ust app pid %d", app
->pid
);
4438 if (!app
->compatible
) {
4439 goto end_no_session
;
4442 ua_sess
= lookup_session_by_app(usess
, app
);
4443 if (ua_sess
== NULL
) {
4444 goto end_no_session
;
4447 pthread_mutex_lock(&ua_sess
->lock
);
4449 if (ua_sess
->deleted
) {
4450 pthread_mutex_unlock(&ua_sess
->lock
);
4451 goto end_no_session
;
4455 * If started = 0, it means that stop trace has been called for a session
4456 * that was never started. It's possible since we can have a fail start
4457 * from either the application manager thread or the command thread. Simply
4458 * indicate that this is a stop error.
4460 if (!ua_sess
->started
) {
4461 goto error_rcu_unlock
;
4464 health_code_update();
4466 /* This inhibits UST tracing */
4467 pthread_mutex_lock(&app
->sock_lock
);
4468 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
4469 pthread_mutex_unlock(&app
->sock_lock
);
4471 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4472 ERR("Error stopping tracing for app pid: %d (ret: %d)",
4475 DBG("UST app stop session failed. Application is dead.");
4477 * This is normal behavior, an application can die during the
4478 * creation process. Don't report an error so the execution can
4479 * continue normally.
4483 goto error_rcu_unlock
;
4486 health_code_update();
4487 ua_sess
->enabled
= 0;
4489 /* Quiescent wait after stopping trace */
4490 pthread_mutex_lock(&app
->sock_lock
);
4491 ret
= ustctl_wait_quiescent(app
->sock
);
4492 pthread_mutex_unlock(&app
->sock_lock
);
4493 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4494 ERR("UST app wait quiescent failed for app pid %d ret %d",
4498 health_code_update();
4500 registry
= get_session_registry(ua_sess
);
4502 /* The UST app session is held registry shall not be null. */
4505 /* Push metadata for application before freeing the application. */
4506 (void) push_metadata(registry
, ua_sess
->consumer
);
4509 pthread_mutex_unlock(&ua_sess
->lock
);
4512 health_code_update();
4516 pthread_mutex_unlock(&ua_sess
->lock
);
4518 health_code_update();
4523 int ust_app_flush_app_session(struct ust_app
*app
,
4524 struct ust_app_session
*ua_sess
)
4526 int ret
, retval
= 0;
4527 struct lttng_ht_iter iter
;
4528 struct ust_app_channel
*ua_chan
;
4529 struct consumer_socket
*socket
;
4531 DBG("Flushing app session buffers for ust app pid %d", app
->pid
);
4535 if (!app
->compatible
) {
4536 goto end_not_compatible
;
4539 pthread_mutex_lock(&ua_sess
->lock
);
4541 if (ua_sess
->deleted
) {
4545 health_code_update();
4547 /* Flushing buffers */
4548 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
4551 /* Flush buffers and push metadata. */
4552 switch (ua_sess
->buffer_type
) {
4553 case LTTNG_BUFFER_PER_PID
:
4554 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4556 health_code_update();
4557 ret
= consumer_flush_channel(socket
, ua_chan
->key
);
4559 ERR("Error flushing consumer channel");
4565 case LTTNG_BUFFER_PER_UID
:
4571 health_code_update();
4574 pthread_mutex_unlock(&ua_sess
->lock
);
4578 health_code_update();
4583 * Flush buffers for all applications for a specific UST session.
4584 * Called with UST session lock held.
4587 int ust_app_flush_session(struct ltt_ust_session
*usess
)
4592 DBG("Flushing session buffers for all ust apps");
4596 /* Flush buffers and push metadata. */
4597 switch (usess
->buffer_type
) {
4598 case LTTNG_BUFFER_PER_UID
:
4600 struct buffer_reg_uid
*reg
;
4601 struct lttng_ht_iter iter
;
4603 /* Flush all per UID buffers associated to that session. */
4604 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4605 struct ust_registry_session
*ust_session_reg
;
4606 struct buffer_reg_channel
*reg_chan
;
4607 struct consumer_socket
*socket
;
4609 /* Get consumer socket to use to push the metadata.*/
4610 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
4613 /* Ignore request if no consumer is found for the session. */
4617 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
4618 reg_chan
, node
.node
) {
4620 * The following call will print error values so the return
4621 * code is of little importance because whatever happens, we
4622 * have to try them all.
4624 (void) consumer_flush_channel(socket
, reg_chan
->consumer_key
);
4627 ust_session_reg
= reg
->registry
->reg
.ust
;
4628 /* Push metadata. */
4629 (void) push_metadata(ust_session_reg
, usess
->consumer
);
4633 case LTTNG_BUFFER_PER_PID
:
4635 struct ust_app_session
*ua_sess
;
4636 struct lttng_ht_iter iter
;
4637 struct ust_app
*app
;
4639 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4640 ua_sess
= lookup_session_by_app(usess
, app
);
4641 if (ua_sess
== NULL
) {
4644 (void) ust_app_flush_app_session(app
, ua_sess
);
4655 health_code_update();
4660 int ust_app_clear_quiescent_app_session(struct ust_app
*app
,
4661 struct ust_app_session
*ua_sess
)
4664 struct lttng_ht_iter iter
;
4665 struct ust_app_channel
*ua_chan
;
4666 struct consumer_socket
*socket
;
4668 DBG("Clearing stream quiescent state for ust app pid %d", app
->pid
);
4672 if (!app
->compatible
) {
4673 goto end_not_compatible
;
4676 pthread_mutex_lock(&ua_sess
->lock
);
4678 if (ua_sess
->deleted
) {
4682 health_code_update();
4684 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
4687 ERR("Failed to find consumer (%" PRIu32
") socket",
4688 app
->bits_per_long
);
4693 /* Clear quiescent state. */
4694 switch (ua_sess
->buffer_type
) {
4695 case LTTNG_BUFFER_PER_PID
:
4696 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
,
4697 ua_chan
, node
.node
) {
4698 health_code_update();
4699 ret
= consumer_clear_quiescent_channel(socket
,
4702 ERR("Error clearing quiescent state for consumer channel");
4708 case LTTNG_BUFFER_PER_UID
:
4715 health_code_update();
4718 pthread_mutex_unlock(&ua_sess
->lock
);
4722 health_code_update();
4727 * Clear quiescent state in each stream for all applications for a
4728 * specific UST session.
4729 * Called with UST session lock held.
4732 int ust_app_clear_quiescent_session(struct ltt_ust_session
*usess
)
4737 DBG("Clearing stream quiescent state for all ust apps");
4741 switch (usess
->buffer_type
) {
4742 case LTTNG_BUFFER_PER_UID
:
4744 struct lttng_ht_iter iter
;
4745 struct buffer_reg_uid
*reg
;
4748 * Clear quiescent for all per UID buffers associated to
4751 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4752 struct consumer_socket
*socket
;
4753 struct buffer_reg_channel
*reg_chan
;
4755 /* Get associated consumer socket.*/
4756 socket
= consumer_find_socket_by_bitness(
4757 reg
->bits_per_long
, usess
->consumer
);
4760 * Ignore request if no consumer is found for
4766 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
,
4767 &iter
.iter
, reg_chan
, node
.node
) {
4769 * The following call will print error values so
4770 * the return code is of little importance
4771 * because whatever happens, we have to try them
4774 (void) consumer_clear_quiescent_channel(socket
,
4775 reg_chan
->consumer_key
);
4780 case LTTNG_BUFFER_PER_PID
:
4782 struct ust_app_session
*ua_sess
;
4783 struct lttng_ht_iter iter
;
4784 struct ust_app
*app
;
4786 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
,
4788 ua_sess
= lookup_session_by_app(usess
, app
);
4789 if (ua_sess
== NULL
) {
4792 (void) ust_app_clear_quiescent_app_session(app
,
4804 health_code_update();
4809 * Destroy a specific UST session in apps.
4811 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4814 struct ust_app_session
*ua_sess
;
4815 struct lttng_ht_iter iter
;
4816 struct lttng_ht_node_u64
*node
;
4818 DBG("Destroy tracing for ust app pid %d", app
->pid
);
4822 if (!app
->compatible
) {
4826 __lookup_session_by_app(usess
, app
, &iter
);
4827 node
= lttng_ht_iter_get_node_u64(&iter
);
4829 /* Session is being or is deleted. */
4832 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
4834 health_code_update();
4835 destroy_app_session(app
, ua_sess
);
4837 health_code_update();
4839 /* Quiescent wait after stopping trace */
4840 pthread_mutex_lock(&app
->sock_lock
);
4841 ret
= ustctl_wait_quiescent(app
->sock
);
4842 pthread_mutex_unlock(&app
->sock_lock
);
4843 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4844 ERR("UST app wait quiescent failed for app pid %d ret %d",
4849 health_code_update();
4854 * Start tracing for the UST session.
4856 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
4858 struct lttng_ht_iter iter
;
4859 struct ust_app
*app
;
4861 DBG("Starting all UST traces");
4864 * Even though the start trace might fail, flag this session active so
4865 * other application coming in are started by default.
4872 * In a start-stop-start use-case, we need to clear the quiescent state
4873 * of each channel set by the prior stop command, thus ensuring that a
4874 * following stop or destroy is sure to grab a timestamp_end near those
4875 * operations, even if the packet is empty.
4877 (void) ust_app_clear_quiescent_session(usess
);
4879 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4880 ust_app_global_update(usess
, app
);
4889 * Start tracing for the UST session.
4890 * Called with UST session lock held.
4892 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
4895 struct lttng_ht_iter iter
;
4896 struct ust_app
*app
;
4898 DBG("Stopping all UST traces");
4901 * Even though the stop trace might fail, flag this session inactive so
4902 * other application coming in are not started by default.
4908 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4909 ret
= ust_app_stop_trace(usess
, app
);
4911 /* Continue to next apps even on error */
4916 (void) ust_app_flush_session(usess
);
4924 * Destroy app UST session.
4926 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
4929 struct lttng_ht_iter iter
;
4930 struct ust_app
*app
;
4932 DBG("Destroy all UST traces");
4936 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4937 ret
= destroy_trace(usess
, app
);
4939 /* Continue to next apps even on error */
4949 /* The ua_sess lock must be held by the caller. */
4951 int find_or_create_ust_app_channel(
4952 struct ltt_ust_session
*usess
,
4953 struct ust_app_session
*ua_sess
,
4954 struct ust_app
*app
,
4955 struct ltt_ust_channel
*uchan
,
4956 struct ust_app_channel
**ua_chan
)
4959 struct lttng_ht_iter iter
;
4960 struct lttng_ht_node_str
*ua_chan_node
;
4962 lttng_ht_lookup(ua_sess
->channels
, (void *) uchan
->name
, &iter
);
4963 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
4965 *ua_chan
= caa_container_of(ua_chan_node
,
4966 struct ust_app_channel
, node
);
4970 ret
= ust_app_channel_create(usess
, ua_sess
, uchan
, app
, ua_chan
);
4979 int ust_app_channel_synchronize_event(struct ust_app_channel
*ua_chan
,
4980 struct ltt_ust_event
*uevent
, struct ust_app_session
*ua_sess
,
4981 struct ust_app
*app
)
4984 struct ust_app_event
*ua_event
= NULL
;
4986 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4987 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
4989 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
4994 if (ua_event
->enabled
!= uevent
->enabled
) {
4995 ret
= uevent
->enabled
?
4996 enable_ust_app_event(ua_sess
, ua_event
, app
) :
4997 disable_ust_app_event(ua_sess
, ua_event
, app
);
5006 * The caller must ensure that the application is compatible and is tracked
5007 * by the process attribute trackers.
5010 void ust_app_synchronize(struct ltt_ust_session
*usess
,
5011 struct ust_app
*app
)
5014 struct cds_lfht_iter uchan_iter
;
5015 struct ltt_ust_channel
*uchan
;
5016 struct ust_app_session
*ua_sess
= NULL
;
5019 * The application's configuration should only be synchronized for
5022 assert(usess
->active
);
5024 ret
= find_or_create_ust_app_session(usess
, app
, &ua_sess
, NULL
);
5026 /* Tracer is probably gone or ENOMEM. */
5031 pthread_mutex_lock(&ua_sess
->lock
);
5032 if (ua_sess
->deleted
) {
5033 pthread_mutex_unlock(&ua_sess
->lock
);
5038 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &uchan_iter
,
5040 struct ust_app_channel
*ua_chan
;
5041 struct cds_lfht_iter uevent_iter
;
5042 struct ltt_ust_event
*uevent
;
5045 * Search for a matching ust_app_channel. If none is found,
5046 * create it. Creating the channel will cause the ua_chan
5047 * structure to be allocated, the channel buffers to be
5048 * allocated (if necessary) and sent to the application, and
5049 * all enabled contexts will be added to the channel.
5051 ret
= find_or_create_ust_app_channel(usess
, ua_sess
,
5052 app
, uchan
, &ua_chan
);
5054 /* Tracer is probably gone or ENOMEM. */
5059 /* ua_chan will be NULL for the metadata channel */
5063 cds_lfht_for_each_entry(uchan
->events
->ht
, &uevent_iter
, uevent
,
5065 ret
= ust_app_channel_synchronize_event(ua_chan
,
5066 uevent
, ua_sess
, app
);
5072 if (ua_chan
->enabled
!= uchan
->enabled
) {
5073 ret
= uchan
->enabled
?
5074 enable_ust_app_channel(ua_sess
, uchan
, app
) :
5075 disable_ust_app_channel(ua_sess
, ua_chan
, app
);
5084 pthread_mutex_unlock(&ua_sess
->lock
);
5085 /* Everything went well at this point. */
5090 pthread_mutex_unlock(&ua_sess
->lock
);
5093 destroy_app_session(app
, ua_sess
);
5099 void ust_app_global_destroy(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5101 struct ust_app_session
*ua_sess
;
5103 ua_sess
= lookup_session_by_app(usess
, app
);
5104 if (ua_sess
== NULL
) {
5107 destroy_app_session(app
, ua_sess
);
5111 * Add channels/events from UST global domain to registered apps at sock.
5113 * Called with session lock held.
5114 * Called with RCU read-side lock held.
5116 void ust_app_global_update(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5119 assert(usess
->active
);
5121 DBG2("UST app global update for app sock %d for session id %" PRIu64
,
5122 app
->sock
, usess
->id
);
5124 if (!app
->compatible
) {
5127 if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID
,
5129 trace_ust_id_tracker_lookup(
5130 LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID
,
5132 trace_ust_id_tracker_lookup(
5133 LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID
,
5136 * Synchronize the application's internal tracing configuration
5137 * and start tracing.
5139 ust_app_synchronize(usess
, app
);
5140 ust_app_start_trace(usess
, app
);
5142 ust_app_global_destroy(usess
, app
);
5147 * Called with session lock held.
5149 void ust_app_global_update_all(struct ltt_ust_session
*usess
)
5151 struct lttng_ht_iter iter
;
5152 struct ust_app
*app
;
5155 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5156 ust_app_global_update(usess
, app
);
5162 * Add context to a specific channel for global UST domain.
5164 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
5165 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
5168 struct lttng_ht_node_str
*ua_chan_node
;
5169 struct lttng_ht_iter iter
, uiter
;
5170 struct ust_app_channel
*ua_chan
= NULL
;
5171 struct ust_app_session
*ua_sess
;
5172 struct ust_app
*app
;
5174 assert(usess
->active
);
5177 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5178 if (!app
->compatible
) {
5180 * TODO: In time, we should notice the caller of this error by
5181 * telling him that this is a version error.
5185 ua_sess
= lookup_session_by_app(usess
, app
);
5186 if (ua_sess
== NULL
) {
5190 pthread_mutex_lock(&ua_sess
->lock
);
5192 if (ua_sess
->deleted
) {
5193 pthread_mutex_unlock(&ua_sess
->lock
);
5197 /* Lookup channel in the ust app session */
5198 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
5199 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
5200 if (ua_chan_node
== NULL
) {
5203 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
5205 ret
= create_ust_app_channel_context(ua_chan
, &uctx
->ctx
, app
);
5210 pthread_mutex_unlock(&ua_sess
->lock
);
5218 * Receive registration and populate the given msg structure.
5220 * On success return 0 else a negative value returned by the ustctl call.
5222 int ust_app_recv_registration(int sock
, struct ust_register_msg
*msg
)
5225 uint32_t pid
, ppid
, uid
, gid
;
5229 ret
= ustctl_recv_reg_msg(sock
, &msg
->type
, &msg
->major
, &msg
->minor
,
5230 &pid
, &ppid
, &uid
, &gid
,
5231 &msg
->bits_per_long
,
5232 &msg
->uint8_t_alignment
,
5233 &msg
->uint16_t_alignment
,
5234 &msg
->uint32_t_alignment
,
5235 &msg
->uint64_t_alignment
,
5236 &msg
->long_alignment
,
5243 case LTTNG_UST_ERR_EXITING
:
5244 DBG3("UST app recv reg message failed. Application died");
5246 case LTTNG_UST_ERR_UNSUP_MAJOR
:
5247 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
5248 msg
->major
, msg
->minor
, LTTNG_UST_ABI_MAJOR_VERSION
,
5249 LTTNG_UST_ABI_MINOR_VERSION
);
5252 ERR("UST app recv reg message failed with ret %d", ret
);
5257 msg
->pid
= (pid_t
) pid
;
5258 msg
->ppid
= (pid_t
) ppid
;
5259 msg
->uid
= (uid_t
) uid
;
5260 msg
->gid
= (gid_t
) gid
;
5267 * Return a ust app session object using the application object and the
5268 * session object descriptor has a key. If not found, NULL is returned.
5269 * A RCU read side lock MUST be acquired when calling this function.
5271 static struct ust_app_session
*find_session_by_objd(struct ust_app
*app
,
5274 struct lttng_ht_node_ulong
*node
;
5275 struct lttng_ht_iter iter
;
5276 struct ust_app_session
*ua_sess
= NULL
;
5280 lttng_ht_lookup(app
->ust_sessions_objd
, (void *)((unsigned long) objd
), &iter
);
5281 node
= lttng_ht_iter_get_node_ulong(&iter
);
5283 DBG2("UST app session find by objd %d not found", objd
);
5287 ua_sess
= caa_container_of(node
, struct ust_app_session
, ust_objd_node
);
5294 * Return a ust app channel object using the application object and the channel
5295 * object descriptor has a key. If not found, NULL is returned. A RCU read side
5296 * lock MUST be acquired before calling this function.
5298 static struct ust_app_channel
*find_channel_by_objd(struct ust_app
*app
,
5301 struct lttng_ht_node_ulong
*node
;
5302 struct lttng_ht_iter iter
;
5303 struct ust_app_channel
*ua_chan
= NULL
;
5307 lttng_ht_lookup(app
->ust_objd
, (void *)((unsigned long) objd
), &iter
);
5308 node
= lttng_ht_iter_get_node_ulong(&iter
);
5310 DBG2("UST app channel find by objd %d not found", objd
);
5314 ua_chan
= caa_container_of(node
, struct ust_app_channel
, ust_objd_node
);
5321 * Reply to a register channel notification from an application on the notify
5322 * socket. The channel metadata is also created.
5324 * The session UST registry lock is acquired in this function.
5326 * On success 0 is returned else a negative value.
5328 static int reply_ust_register_channel(int sock
, int cobjd
,
5329 size_t nr_fields
, struct ustctl_field
*fields
)
5331 int ret
, ret_code
= 0;
5333 uint64_t chan_reg_key
;
5334 enum ustctl_channel_header type
;
5335 struct ust_app
*app
;
5336 struct ust_app_channel
*ua_chan
;
5337 struct ust_app_session
*ua_sess
;
5338 struct ust_registry_session
*registry
;
5339 struct ust_registry_channel
*chan_reg
;
5343 /* Lookup application. If not found, there is a code flow error. */
5344 app
= find_app_by_notify_sock(sock
);
5346 DBG("Application socket %d is being torn down. Abort event notify",
5349 goto error_rcu_unlock
;
5352 /* Lookup channel by UST object descriptor. */
5353 ua_chan
= find_channel_by_objd(app
, cobjd
);
5355 DBG("Application channel is being torn down. Abort event notify");
5357 goto error_rcu_unlock
;
5360 assert(ua_chan
->session
);
5361 ua_sess
= ua_chan
->session
;
5363 /* Get right session registry depending on the session buffer type. */
5364 registry
= get_session_registry(ua_sess
);
5366 DBG("Application session is being torn down. Abort event notify");
5368 goto error_rcu_unlock
;
5371 /* Depending on the buffer type, a different channel key is used. */
5372 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
5373 chan_reg_key
= ua_chan
->tracing_channel_id
;
5375 chan_reg_key
= ua_chan
->key
;
5378 pthread_mutex_lock(®istry
->lock
);
5380 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
5383 if (!chan_reg
->register_done
) {
5385 * TODO: eventually use the registry event count for
5386 * this channel to better guess header type for per-pid
5389 type
= USTCTL_CHANNEL_HEADER_LARGE
;
5390 chan_reg
->nr_ctx_fields
= nr_fields
;
5391 chan_reg
->ctx_fields
= fields
;
5393 chan_reg
->header_type
= type
;
5395 /* Get current already assigned values. */
5396 type
= chan_reg
->header_type
;
5398 /* Channel id is set during the object creation. */
5399 chan_id
= chan_reg
->chan_id
;
5401 /* Append to metadata */
5402 if (!chan_reg
->metadata_dumped
) {
5403 ret_code
= ust_metadata_channel_statedump(registry
, chan_reg
);
5405 ERR("Error appending channel metadata (errno = %d)", ret_code
);
5411 DBG3("UST app replying to register channel key %" PRIu64
5412 " with id %u, type: %d, ret: %d", chan_reg_key
, chan_id
, type
,
5415 ret
= ustctl_reply_register_channel(sock
, chan_id
, type
, ret_code
);
5417 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5418 ERR("UST app reply channel failed with ret %d", ret
);
5420 DBG3("UST app reply channel failed. Application died");
5425 /* This channel registry registration is completed. */
5426 chan_reg
->register_done
= 1;
5429 pthread_mutex_unlock(®istry
->lock
);
5437 * Add event to the UST channel registry. When the event is added to the
5438 * registry, the metadata is also created. Once done, this replies to the
5439 * application with the appropriate error code.
5441 * The session UST registry lock is acquired in the function.
5443 * On success 0 is returned else a negative value.
5445 static int add_event_ust_registry(int sock
, int sobjd
, int cobjd
, char *name
,
5446 char *sig
, size_t nr_fields
, struct ustctl_field
*fields
,
5447 int loglevel_value
, char *model_emf_uri
)
5450 uint32_t event_id
= 0;
5451 uint64_t chan_reg_key
;
5452 struct ust_app
*app
;
5453 struct ust_app_channel
*ua_chan
;
5454 struct ust_app_session
*ua_sess
;
5455 struct ust_registry_session
*registry
;
5459 /* Lookup application. If not found, there is a code flow error. */
5460 app
= find_app_by_notify_sock(sock
);
5462 DBG("Application socket %d is being torn down. Abort event notify",
5465 goto error_rcu_unlock
;
5468 /* Lookup channel by UST object descriptor. */
5469 ua_chan
= find_channel_by_objd(app
, cobjd
);
5471 DBG("Application channel is being torn down. Abort event notify");
5473 goto error_rcu_unlock
;
5476 assert(ua_chan
->session
);
5477 ua_sess
= ua_chan
->session
;
5479 registry
= get_session_registry(ua_sess
);
5481 DBG("Application session is being torn down. Abort event notify");
5483 goto error_rcu_unlock
;
5486 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
5487 chan_reg_key
= ua_chan
->tracing_channel_id
;
5489 chan_reg_key
= ua_chan
->key
;
5492 pthread_mutex_lock(®istry
->lock
);
5495 * From this point on, this call acquires the ownership of the sig, fields
5496 * and model_emf_uri meaning any free are done inside it if needed. These
5497 * three variables MUST NOT be read/write after this.
5499 ret_code
= ust_registry_create_event(registry
, chan_reg_key
,
5500 sobjd
, cobjd
, name
, sig
, nr_fields
, fields
,
5501 loglevel_value
, model_emf_uri
, ua_sess
->buffer_type
,
5505 model_emf_uri
= NULL
;
5508 * The return value is returned to ustctl so in case of an error, the
5509 * application can be notified. In case of an error, it's important not to
5510 * return a negative error or else the application will get closed.
5512 ret
= ustctl_reply_register_event(sock
, event_id
, ret_code
);
5514 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5515 ERR("UST app reply event failed with ret %d", ret
);
5517 DBG3("UST app reply event failed. Application died");
5520 * No need to wipe the create event since the application socket will
5521 * get close on error hence cleaning up everything by itself.
5526 DBG3("UST registry event %s with id %" PRId32
" added successfully",
5530 pthread_mutex_unlock(®istry
->lock
);
5535 free(model_emf_uri
);
5540 * Add enum to the UST session registry. Once done, this replies to the
5541 * application with the appropriate error code.
5543 * The session UST registry lock is acquired within this function.
5545 * On success 0 is returned else a negative value.
5547 static int add_enum_ust_registry(int sock
, int sobjd
, char *name
,
5548 struct ustctl_enum_entry
*entries
, size_t nr_entries
)
5550 int ret
= 0, ret_code
;
5551 struct ust_app
*app
;
5552 struct ust_app_session
*ua_sess
;
5553 struct ust_registry_session
*registry
;
5554 uint64_t enum_id
= -1ULL;
5558 /* Lookup application. If not found, there is a code flow error. */
5559 app
= find_app_by_notify_sock(sock
);
5561 /* Return an error since this is not an error */
5562 DBG("Application socket %d is being torn down. Aborting enum registration",
5565 goto error_rcu_unlock
;
5568 /* Lookup session by UST object descriptor. */
5569 ua_sess
= find_session_by_objd(app
, sobjd
);
5571 /* Return an error since this is not an error */
5572 DBG("Application session is being torn down (session not found). Aborting enum registration.");
5574 goto error_rcu_unlock
;
5577 registry
= get_session_registry(ua_sess
);
5579 DBG("Application session is being torn down (registry not found). Aborting enum registration.");
5581 goto error_rcu_unlock
;
5584 pthread_mutex_lock(®istry
->lock
);
5587 * From this point on, the callee acquires the ownership of
5588 * entries. The variable entries MUST NOT be read/written after
5591 ret_code
= ust_registry_create_or_find_enum(registry
, sobjd
, name
,
5592 entries
, nr_entries
, &enum_id
);
5596 * The return value is returned to ustctl so in case of an error, the
5597 * application can be notified. In case of an error, it's important not to
5598 * return a negative error or else the application will get closed.
5600 ret
= ustctl_reply_register_enum(sock
, enum_id
, ret_code
);
5602 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5603 ERR("UST app reply enum failed with ret %d", ret
);
5605 DBG3("UST app reply enum failed. Application died");
5608 * No need to wipe the create enum since the application socket will
5609 * get close on error hence cleaning up everything by itself.
5614 DBG3("UST registry enum %s added successfully or already found", name
);
5617 pthread_mutex_unlock(®istry
->lock
);
5624 * Handle application notification through the given notify socket.
5626 * Return 0 on success or else a negative value.
5628 int ust_app_recv_notify(int sock
)
5631 enum ustctl_notify_cmd cmd
;
5633 DBG3("UST app receiving notify from sock %d", sock
);
5635 ret
= ustctl_recv_notify(sock
, &cmd
);
5637 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5638 ERR("UST app recv notify failed with ret %d", ret
);
5640 DBG3("UST app recv notify failed. Application died");
5646 case USTCTL_NOTIFY_CMD_EVENT
:
5648 int sobjd
, cobjd
, loglevel_value
;
5649 char name
[LTTNG_UST_SYM_NAME_LEN
], *sig
, *model_emf_uri
;
5651 struct ustctl_field
*fields
;
5653 DBG2("UST app ustctl register event received");
5655 ret
= ustctl_recv_register_event(sock
, &sobjd
, &cobjd
, name
,
5656 &loglevel_value
, &sig
, &nr_fields
, &fields
,
5659 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5660 ERR("UST app recv event failed with ret %d", ret
);
5662 DBG3("UST app recv event failed. Application died");
5668 * Add event to the UST registry coming from the notify socket. This
5669 * call will free if needed the sig, fields and model_emf_uri. This
5670 * code path loses the ownsership of these variables and transfer them
5671 * to the this function.
5673 ret
= add_event_ust_registry(sock
, sobjd
, cobjd
, name
, sig
, nr_fields
,
5674 fields
, loglevel_value
, model_emf_uri
);
5681 case USTCTL_NOTIFY_CMD_CHANNEL
:
5685 struct ustctl_field
*fields
;
5687 DBG2("UST app ustctl register channel received");
5689 ret
= ustctl_recv_register_channel(sock
, &sobjd
, &cobjd
, &nr_fields
,
5692 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5693 ERR("UST app recv channel failed with ret %d", ret
);
5695 DBG3("UST app recv channel failed. Application died");
5701 * The fields ownership are transfered to this function call meaning
5702 * that if needed it will be freed. After this, it's invalid to access
5703 * fields or clean it up.
5705 ret
= reply_ust_register_channel(sock
, cobjd
, nr_fields
,
5713 case USTCTL_NOTIFY_CMD_ENUM
:
5716 char name
[LTTNG_UST_SYM_NAME_LEN
];
5718 struct ustctl_enum_entry
*entries
;
5720 DBG2("UST app ustctl register enum received");
5722 ret
= ustctl_recv_register_enum(sock
, &sobjd
, name
,
5723 &entries
, &nr_entries
);
5725 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5726 ERR("UST app recv enum failed with ret %d", ret
);
5728 DBG3("UST app recv enum failed. Application died");
5733 /* Callee assumes ownership of entries */
5734 ret
= add_enum_ust_registry(sock
, sobjd
, name
,
5735 entries
, nr_entries
);
5743 /* Should NEVER happen. */
5752 * Once the notify socket hangs up, this is called. First, it tries to find the
5753 * corresponding application. On failure, the call_rcu to close the socket is
5754 * executed. If an application is found, it tries to delete it from the notify
5755 * socket hash table. Whathever the result, it proceeds to the call_rcu.
5757 * Note that an object needs to be allocated here so on ENOMEM failure, the
5758 * call RCU is not done but the rest of the cleanup is.
5760 void ust_app_notify_sock_unregister(int sock
)
5763 struct lttng_ht_iter iter
;
5764 struct ust_app
*app
;
5765 struct ust_app_notify_sock_obj
*obj
;
5771 obj
= zmalloc(sizeof(*obj
));
5774 * An ENOMEM is kind of uncool. If this strikes we continue the
5775 * procedure but the call_rcu will not be called. In this case, we
5776 * accept the fd leak rather than possibly creating an unsynchronized
5777 * state between threads.
5779 * TODO: The notify object should be created once the notify socket is
5780 * registered and stored independantely from the ust app object. The
5781 * tricky part is to synchronize the teardown of the application and
5782 * this notify object. Let's keep that in mind so we can avoid this
5783 * kind of shenanigans with ENOMEM in the teardown path.
5790 DBG("UST app notify socket unregister %d", sock
);
5793 * Lookup application by notify socket. If this fails, this means that the
5794 * hash table delete has already been done by the application
5795 * unregistration process so we can safely close the notify socket in a
5798 app
= find_app_by_notify_sock(sock
);
5803 iter
.iter
.node
= &app
->notify_sock_n
.node
;
5806 * Whatever happens here either we fail or succeed, in both cases we have
5807 * to close the socket after a grace period to continue to the call RCU
5808 * here. If the deletion is successful, the application is not visible
5809 * anymore by other threads and is it fails it means that it was already
5810 * deleted from the hash table so either way we just have to close the
5813 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
5819 * Close socket after a grace period to avoid for the socket to be reused
5820 * before the application object is freed creating potential race between
5821 * threads trying to add unique in the global hash table.
5824 call_rcu(&obj
->head
, close_notify_sock_rcu
);
5829 * Destroy a ust app data structure and free its memory.
5831 void ust_app_destroy(struct ust_app
*app
)
5837 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
5841 * Take a snapshot for a given UST session. The snapshot is sent to the given
5844 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
5846 enum lttng_error_code
ust_app_snapshot_record(
5847 const struct ltt_ust_session
*usess
,
5848 const struct consumer_output
*output
, int wait
,
5849 uint64_t nb_packets_per_stream
)
5852 enum lttng_error_code status
= LTTNG_OK
;
5853 struct lttng_ht_iter iter
;
5854 struct ust_app
*app
;
5855 char *trace_path
= NULL
;
5862 switch (usess
->buffer_type
) {
5863 case LTTNG_BUFFER_PER_UID
:
5865 struct buffer_reg_uid
*reg
;
5867 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5868 struct buffer_reg_channel
*reg_chan
;
5869 struct consumer_socket
*socket
;
5870 char pathname
[PATH_MAX
];
5871 size_t consumer_path_offset
= 0;
5873 if (!reg
->registry
->reg
.ust
->metadata_key
) {
5874 /* Skip since no metadata is present */
5878 /* Get consumer socket to use to push the metadata.*/
5879 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
5882 status
= LTTNG_ERR_INVALID
;
5886 memset(pathname
, 0, sizeof(pathname
));
5887 ret
= snprintf(pathname
, sizeof(pathname
),
5888 DEFAULT_UST_TRACE_DIR
"/" DEFAULT_UST_TRACE_UID_PATH
,
5889 reg
->uid
, reg
->bits_per_long
);
5891 PERROR("snprintf snapshot path");
5892 status
= LTTNG_ERR_INVALID
;
5895 /* Free path allowed on previous iteration. */
5897 trace_path
= setup_channel_trace_path(usess
->consumer
, pathname
,
5898 &consumer_path_offset
);
5900 status
= LTTNG_ERR_INVALID
;
5903 /* Add the UST default trace dir to path. */
5904 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5905 reg_chan
, node
.node
) {
5906 status
= consumer_snapshot_channel(socket
,
5907 reg_chan
->consumer_key
,
5908 output
, 0, usess
->uid
,
5909 usess
->gid
, &trace_path
[consumer_path_offset
], wait
,
5910 nb_packets_per_stream
);
5911 if (status
!= LTTNG_OK
) {
5915 status
= consumer_snapshot_channel(socket
,
5916 reg
->registry
->reg
.ust
->metadata_key
, output
, 1,
5917 usess
->uid
, usess
->gid
, &trace_path
[consumer_path_offset
],
5919 if (status
!= LTTNG_OK
) {
5925 case LTTNG_BUFFER_PER_PID
:
5927 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5928 struct consumer_socket
*socket
;
5929 struct lttng_ht_iter chan_iter
;
5930 struct ust_app_channel
*ua_chan
;
5931 struct ust_app_session
*ua_sess
;
5932 struct ust_registry_session
*registry
;
5933 char pathname
[PATH_MAX
];
5934 size_t consumer_path_offset
= 0;
5936 ua_sess
= lookup_session_by_app(usess
, app
);
5938 /* Session not associated with this app. */
5942 /* Get the right consumer socket for the application. */
5943 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
5946 status
= LTTNG_ERR_INVALID
;
5950 /* Add the UST default trace dir to path. */
5951 memset(pathname
, 0, sizeof(pathname
));
5952 ret
= snprintf(pathname
, sizeof(pathname
), DEFAULT_UST_TRACE_DIR
"/%s",
5955 status
= LTTNG_ERR_INVALID
;
5956 PERROR("snprintf snapshot path");
5959 /* Free path allowed on previous iteration. */
5961 trace_path
= setup_channel_trace_path(usess
->consumer
, pathname
,
5962 &consumer_path_offset
);
5964 status
= LTTNG_ERR_INVALID
;
5967 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
5968 ua_chan
, node
.node
) {
5969 status
= consumer_snapshot_channel(socket
,
5970 ua_chan
->key
, output
, 0,
5971 lttng_credentials_get_uid(&ua_sess
->effective_credentials
),
5972 lttng_credentials_get_gid(&ua_sess
->effective_credentials
),
5973 &trace_path
[consumer_path_offset
], wait
,
5974 nb_packets_per_stream
);
5978 case LTTNG_ERR_CHAN_NOT_FOUND
:
5985 registry
= get_session_registry(ua_sess
);
5987 DBG("Application session is being torn down. Skip application.");
5990 status
= consumer_snapshot_channel(socket
,
5991 registry
->metadata_key
, output
, 1,
5992 lttng_credentials_get_uid(&ua_sess
->effective_credentials
),
5993 lttng_credentials_get_gid(&ua_sess
->effective_credentials
),
5994 &trace_path
[consumer_path_offset
], wait
, 0);
5998 case LTTNG_ERR_CHAN_NOT_FOUND
:
6018 * Return the size taken by one more packet per stream.
6020 uint64_t ust_app_get_size_one_more_packet_per_stream(
6021 const struct ltt_ust_session
*usess
, uint64_t cur_nr_packets
)
6023 uint64_t tot_size
= 0;
6024 struct ust_app
*app
;
6025 struct lttng_ht_iter iter
;
6029 switch (usess
->buffer_type
) {
6030 case LTTNG_BUFFER_PER_UID
:
6032 struct buffer_reg_uid
*reg
;
6034 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
6035 struct buffer_reg_channel
*reg_chan
;
6038 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
6039 reg_chan
, node
.node
) {
6040 if (cur_nr_packets
>= reg_chan
->num_subbuf
) {
6042 * Don't take channel into account if we
6043 * already grab all its packets.
6047 tot_size
+= reg_chan
->subbuf_size
* reg_chan
->stream_count
;
6053 case LTTNG_BUFFER_PER_PID
:
6056 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6057 struct ust_app_channel
*ua_chan
;
6058 struct ust_app_session
*ua_sess
;
6059 struct lttng_ht_iter chan_iter
;
6061 ua_sess
= lookup_session_by_app(usess
, app
);
6063 /* Session not associated with this app. */
6067 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
6068 ua_chan
, node
.node
) {
6069 if (cur_nr_packets
>= ua_chan
->attr
.num_subbuf
) {
6071 * Don't take channel into account if we
6072 * already grab all its packets.
6076 tot_size
+= ua_chan
->attr
.subbuf_size
* ua_chan
->streams
.count
;
6090 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id
,
6091 struct cds_list_head
*buffer_reg_uid_list
,
6092 struct consumer_output
*consumer
, uint64_t uchan_id
,
6093 int overwrite
, uint64_t *discarded
, uint64_t *lost
)
6096 uint64_t consumer_chan_key
;
6101 ret
= buffer_reg_uid_consumer_channel_key(
6102 buffer_reg_uid_list
, uchan_id
, &consumer_chan_key
);
6110 ret
= consumer_get_lost_packets(ust_session_id
,
6111 consumer_chan_key
, consumer
, lost
);
6113 ret
= consumer_get_discarded_events(ust_session_id
,
6114 consumer_chan_key
, consumer
, discarded
);
6121 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session
*usess
,
6122 struct ltt_ust_channel
*uchan
,
6123 struct consumer_output
*consumer
, int overwrite
,
6124 uint64_t *discarded
, uint64_t *lost
)
6127 struct lttng_ht_iter iter
;
6128 struct lttng_ht_node_str
*ua_chan_node
;
6129 struct ust_app
*app
;
6130 struct ust_app_session
*ua_sess
;
6131 struct ust_app_channel
*ua_chan
;
6138 * Iterate over every registered applications. Sum counters for
6139 * all applications containing requested session and channel.
6141 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6142 struct lttng_ht_iter uiter
;
6144 ua_sess
= lookup_session_by_app(usess
, app
);
6145 if (ua_sess
== NULL
) {
6150 lttng_ht_lookup(ua_sess
->channels
, (void *) uchan
->name
, &uiter
);
6151 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
6152 /* If the session is found for the app, the channel must be there */
6153 assert(ua_chan_node
);
6155 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
6160 ret
= consumer_get_lost_packets(usess
->id
, ua_chan
->key
,
6167 uint64_t _discarded
;
6169 ret
= consumer_get_discarded_events(usess
->id
,
6170 ua_chan
->key
, consumer
, &_discarded
);
6174 (*discarded
) += _discarded
;
6183 int ust_app_regenerate_statedump(struct ltt_ust_session
*usess
,
6184 struct ust_app
*app
)
6187 struct ust_app_session
*ua_sess
;
6189 DBG("Regenerating the metadata for ust app pid %d", app
->pid
);
6193 ua_sess
= lookup_session_by_app(usess
, app
);
6194 if (ua_sess
== NULL
) {
6195 /* The session is in teardown process. Ignore and continue. */
6199 pthread_mutex_lock(&ua_sess
->lock
);
6201 if (ua_sess
->deleted
) {
6205 pthread_mutex_lock(&app
->sock_lock
);
6206 ret
= ustctl_regenerate_statedump(app
->sock
, ua_sess
->handle
);
6207 pthread_mutex_unlock(&app
->sock_lock
);
6210 pthread_mutex_unlock(&ua_sess
->lock
);
6214 health_code_update();
6219 * Regenerate the statedump for each app in the session.
6221 int ust_app_regenerate_statedump_all(struct ltt_ust_session
*usess
)
6224 struct lttng_ht_iter iter
;
6225 struct ust_app
*app
;
6227 DBG("Regenerating the metadata for all UST apps");
6231 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6232 if (!app
->compatible
) {
6236 ret
= ust_app_regenerate_statedump(usess
, app
);
6238 /* Continue to the next app even on error */
6249 * Rotate all the channels of a session.
6251 * Return LTTNG_OK on success or else an LTTng error code.
6253 enum lttng_error_code
ust_app_rotate_session(struct ltt_session
*session
)
6256 enum lttng_error_code cmd_ret
= LTTNG_OK
;
6257 struct lttng_ht_iter iter
;
6258 struct ust_app
*app
;
6259 struct ltt_ust_session
*usess
= session
->ust_session
;
6265 switch (usess
->buffer_type
) {
6266 case LTTNG_BUFFER_PER_UID
:
6268 struct buffer_reg_uid
*reg
;
6270 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
6271 struct buffer_reg_channel
*reg_chan
;
6272 struct consumer_socket
*socket
;
6274 if (!reg
->registry
->reg
.ust
->metadata_key
) {
6275 /* Skip since no metadata is present */
6279 /* Get consumer socket to use to push the metadata.*/
6280 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
6283 cmd_ret
= LTTNG_ERR_INVALID
;
6287 /* Rotate the data channels. */
6288 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
6289 reg_chan
, node
.node
) {
6290 ret
= consumer_rotate_channel(socket
,
6291 reg_chan
->consumer_key
,
6292 usess
->uid
, usess
->gid
,
6294 /* is_metadata_channel */ false);
6296 cmd_ret
= LTTNG_ERR_ROTATION_FAIL_CONSUMER
;
6301 (void) push_metadata(reg
->registry
->reg
.ust
, usess
->consumer
);
6303 ret
= consumer_rotate_channel(socket
,
6304 reg
->registry
->reg
.ust
->metadata_key
,
6305 usess
->uid
, usess
->gid
,
6307 /* is_metadata_channel */ true);
6309 cmd_ret
= LTTNG_ERR_ROTATION_FAIL_CONSUMER
;
6315 case LTTNG_BUFFER_PER_PID
:
6317 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6318 struct consumer_socket
*socket
;
6319 struct lttng_ht_iter chan_iter
;
6320 struct ust_app_channel
*ua_chan
;
6321 struct ust_app_session
*ua_sess
;
6322 struct ust_registry_session
*registry
;
6324 ua_sess
= lookup_session_by_app(usess
, app
);
6326 /* Session not associated with this app. */
6330 /* Get the right consumer socket for the application. */
6331 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
6334 cmd_ret
= LTTNG_ERR_INVALID
;
6338 registry
= get_session_registry(ua_sess
);
6340 DBG("Application session is being torn down. Skip application.");
6344 /* Rotate the data channels. */
6345 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
6346 ua_chan
, node
.node
) {
6347 ret
= consumer_rotate_channel(socket
,
6349 lttng_credentials_get_uid(&ua_sess
->effective_credentials
),
6350 lttng_credentials_get_gid(&ua_sess
->effective_credentials
),
6352 /* is_metadata_channel */ false);
6354 /* Per-PID buffer and application going away. */
6355 if (ret
== -LTTNG_ERR_CHAN_NOT_FOUND
)
6357 cmd_ret
= LTTNG_ERR_ROTATION_FAIL_CONSUMER
;
6362 /* Rotate the metadata channel. */
6363 (void) push_metadata(registry
, usess
->consumer
);
6364 ret
= consumer_rotate_channel(socket
,
6365 registry
->metadata_key
,
6366 lttng_credentials_get_uid(&ua_sess
->effective_credentials
),
6367 lttng_credentials_get_gid(&ua_sess
->effective_credentials
),
6369 /* is_metadata_channel */ true);
6371 /* Per-PID buffer and application going away. */
6372 if (ret
== -LTTNG_ERR_CHAN_NOT_FOUND
)
6374 cmd_ret
= LTTNG_ERR_ROTATION_FAIL_CONSUMER
;
6392 enum lttng_error_code
ust_app_create_channel_subdirectories(
6393 const struct ltt_ust_session
*usess
)
6395 enum lttng_error_code ret
= LTTNG_OK
;
6396 struct lttng_ht_iter iter
;
6397 enum lttng_trace_chunk_status chunk_status
;
6398 char *pathname_index
;
6401 assert(usess
->current_trace_chunk
);
6404 switch (usess
->buffer_type
) {
6405 case LTTNG_BUFFER_PER_UID
:
6407 struct buffer_reg_uid
*reg
;
6409 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
6410 fmt_ret
= asprintf(&pathname_index
,
6411 DEFAULT_UST_TRACE_DIR
"/" DEFAULT_UST_TRACE_UID_PATH
"/" DEFAULT_INDEX_DIR
,
6412 reg
->uid
, reg
->bits_per_long
);
6414 ERR("Failed to format channel index directory");
6415 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
6420 * Create the index subdirectory which will take care
6421 * of implicitly creating the channel's path.
6423 chunk_status
= lttng_trace_chunk_create_subdirectory(
6424 usess
->current_trace_chunk
,
6426 free(pathname_index
);
6427 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
6428 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
6434 case LTTNG_BUFFER_PER_PID
:
6436 struct ust_app
*app
;
6439 * Create the toplevel ust/ directory in case no apps are running.
6441 chunk_status
= lttng_trace_chunk_create_subdirectory(
6442 usess
->current_trace_chunk
,
6443 DEFAULT_UST_TRACE_DIR
);
6444 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
6445 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
6449 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
,
6451 struct ust_app_session
*ua_sess
;
6452 struct ust_registry_session
*registry
;
6454 ua_sess
= lookup_session_by_app(usess
, app
);
6456 /* Session not associated with this app. */
6460 registry
= get_session_registry(ua_sess
);
6462 DBG("Application session is being torn down. Skip application.");
6466 fmt_ret
= asprintf(&pathname_index
,
6467 DEFAULT_UST_TRACE_DIR
"/%s/" DEFAULT_INDEX_DIR
,
6470 ERR("Failed to format channel index directory");
6471 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
6475 * Create the index subdirectory which will take care
6476 * of implicitly creating the channel's path.
6478 chunk_status
= lttng_trace_chunk_create_subdirectory(
6479 usess
->current_trace_chunk
,
6481 free(pathname_index
);
6482 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
6483 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
6500 * Clear all the channels of a session.
6502 * Return LTTNG_OK on success or else an LTTng error code.
6504 enum lttng_error_code
ust_app_clear_session(struct ltt_session
*session
)
6507 enum lttng_error_code cmd_ret
= LTTNG_OK
;
6508 struct lttng_ht_iter iter
;
6509 struct ust_app
*app
;
6510 struct ltt_ust_session
*usess
= session
->ust_session
;
6516 if (usess
->active
) {
6517 ERR("Expecting inactive session %s (%" PRIu64
")", session
->name
, session
->id
);
6518 cmd_ret
= LTTNG_ERR_FATAL
;
6522 switch (usess
->buffer_type
) {
6523 case LTTNG_BUFFER_PER_UID
:
6525 struct buffer_reg_uid
*reg
;
6527 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
6528 struct buffer_reg_channel
*reg_chan
;
6529 struct consumer_socket
*socket
;
6531 /* Get consumer socket to use to push the metadata.*/
6532 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
6535 cmd_ret
= LTTNG_ERR_INVALID
;
6539 /* Clear the data channels. */
6540 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
6541 reg_chan
, node
.node
) {
6542 ret
= consumer_clear_channel(socket
,
6543 reg_chan
->consumer_key
);
6549 (void) push_metadata(reg
->registry
->reg
.ust
, usess
->consumer
);
6552 * Clear the metadata channel.
6553 * Metadata channel is not cleared per se but we still need to
6554 * perform a rotation operation on it behind the scene.
6556 ret
= consumer_clear_channel(socket
,
6557 reg
->registry
->reg
.ust
->metadata_key
);
6564 case LTTNG_BUFFER_PER_PID
:
6566 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6567 struct consumer_socket
*socket
;
6568 struct lttng_ht_iter chan_iter
;
6569 struct ust_app_channel
*ua_chan
;
6570 struct ust_app_session
*ua_sess
;
6571 struct ust_registry_session
*registry
;
6573 ua_sess
= lookup_session_by_app(usess
, app
);
6575 /* Session not associated with this app. */
6579 /* Get the right consumer socket for the application. */
6580 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
6583 cmd_ret
= LTTNG_ERR_INVALID
;
6587 registry
= get_session_registry(ua_sess
);
6589 DBG("Application session is being torn down. Skip application.");
6593 /* Clear the data channels. */
6594 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
6595 ua_chan
, node
.node
) {
6596 ret
= consumer_clear_channel(socket
, ua_chan
->key
);
6598 /* Per-PID buffer and application going away. */
6599 if (ret
== -LTTNG_ERR_CHAN_NOT_FOUND
) {
6606 (void) push_metadata(registry
, usess
->consumer
);
6609 * Clear the metadata channel.
6610 * Metadata channel is not cleared per se but we still need to
6611 * perform rotation operation on it behind the scene.
6613 ret
= consumer_clear_channel(socket
, registry
->metadata_key
);
6615 /* Per-PID buffer and application going away. */
6616 if (ret
== -LTTNG_ERR_CHAN_NOT_FOUND
) {
6634 case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED
:
6635 cmd_ret
= LTTNG_ERR_CLEAR_RELAY_DISALLOWED
;
6638 cmd_ret
= LTTNG_ERR_CLEAR_FAIL_CONSUMER
;
6648 * This function skips the metadata channel as the begin/end timestamps of a
6649 * metadata packet are useless.
6651 * Moreover, opening a packet after a "clear" will cause problems for live
6652 * sessions as it will introduce padding that was not part of the first trace
6653 * chunk. The relay daemon expects the content of the metadata stream of
6654 * successive metadata trace chunks to be strict supersets of one another.
6656 * For example, flushing a packet at the beginning of the metadata stream of
6657 * a trace chunk resulting from a "clear" session command will cause the
6658 * size of the metadata stream of the new trace chunk to not match the size of
6659 * the metadata stream of the original chunk. This will confuse the relay
6660 * daemon as the same "offset" in a metadata stream will no longer point
6661 * to the same content.
6663 enum lttng_error_code
ust_app_open_packets(struct ltt_session
*session
)
6665 enum lttng_error_code ret
= LTTNG_OK
;
6666 struct lttng_ht_iter iter
;
6667 struct ltt_ust_session
*usess
= session
->ust_session
;
6673 switch (usess
->buffer_type
) {
6674 case LTTNG_BUFFER_PER_UID
:
6676 struct buffer_reg_uid
*reg
;
6678 cds_list_for_each_entry (
6679 reg
, &usess
->buffer_reg_uid_list
, lnode
) {
6680 struct buffer_reg_channel
*reg_chan
;
6681 struct consumer_socket
*socket
;
6683 socket
= consumer_find_socket_by_bitness(
6684 reg
->bits_per_long
, usess
->consumer
);
6686 ret
= LTTNG_ERR_FATAL
;
6690 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
,
6691 &iter
.iter
, reg_chan
, node
.node
) {
6692 const int open_ret
=
6693 consumer_open_channel_packets(
6695 reg_chan
->consumer_key
);
6698 ret
= LTTNG_ERR_UNK
;
6705 case LTTNG_BUFFER_PER_PID
:
6707 struct ust_app
*app
;
6709 cds_lfht_for_each_entry (
6710 ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6711 struct consumer_socket
*socket
;
6712 struct lttng_ht_iter chan_iter
;
6713 struct ust_app_channel
*ua_chan
;
6714 struct ust_app_session
*ua_sess
;
6715 struct ust_registry_session
*registry
;
6717 ua_sess
= lookup_session_by_app(usess
, app
);
6719 /* Session not associated with this app. */
6723 /* Get the right consumer socket for the application. */
6724 socket
= consumer_find_socket_by_bitness(
6725 app
->bits_per_long
, usess
->consumer
);
6727 ret
= LTTNG_ERR_FATAL
;
6731 registry
= get_session_registry(ua_sess
);
6733 DBG("Application session is being torn down. Skip application.");
6737 cds_lfht_for_each_entry(ua_sess
->channels
->ht
,
6738 &chan_iter
.iter
, ua_chan
, node
.node
) {
6739 const int open_ret
=
6740 consumer_open_channel_packets(
6746 * Per-PID buffer and application going
6749 if (open_ret
== -LTTNG_ERR_CHAN_NOT_FOUND
) {
6753 ret
= LTTNG_ERR_UNK
;